Perhaps you should try some spelling variations:
khoa tang » kho tang, khoa dang, khoa tieng
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
dac khoa » da khoa, dai khoa, dau khoa
dinh cuu » dinh chi
tang xa » trang xa, tang ma, lang xa
vi cuu » vi luu, vinh cuu
te dac » le dac, te dao, te dau
loc va » hoc va, luc va
soc va » hoc va, doc va, goc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te dac khoa tang xa hoi. hieu van tham ((soc va) or (loc va)) hanh ((vi cuu) or (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te dac khoa tang xa hoi. hieu van tham ((soc va) OR (loc va)) hanh ((vi cuu) OR (dinh cuu)) tre.
• Adding a wildcard symbol may retrieve word variants: te dac khoa tang xa hoi. hieu van tham ((soc va) or (loc va)) hanh ((vi cuu) or (dinh cuu)) tre*.