Perhaps you should try some spelling variations:
"thong phap hoc." » "chong phap hoc." (Expand Search), "phuong phap hoc." (Expand Search), "thong nhat hoc." (Expand Search), "thong phap khoa." (Expand Search), "thong phap thuc." (Expand Search), "thong phap o." (Expand Search)
"trong phap hoc." » "trong phat hoc." (Expand Search), "chong phap hoc." (Expand Search), "trong hai hoc." (Expand Search), "trong phap khoa." (Expand Search), "trong phap thuc." (Expand Search), "trong phap o." (Expand Search)
"thoi phap hoc." » "thi phap hoc." (Expand Search), "toi pham hoc." (Expand Search), "hoi phat hoc." (Expand Search), "thoi phap khoa." (Expand Search), "thoi phap thuc." (Expand Search), "thoi phap o." (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("thoi phap hoc.") OR ((("thong phap hoc.") OR ("trong phap hoc."))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"thoi phap hoc.\") OR (((\"thong phap hoc.\") OR (\"trong phap hoc.\"))))".
• Removing quotes may allow a broader search: (( thoi phap hoc. ) OR ((( thong phap hoc. ) OR ( trong phap hoc. )))).
• Adding a wildcard symbol may retrieve word variants: (("thoi phap hoc.") OR ((("thong phap hoc.") OR ("trong phap hoc."))))*.