Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
trung cap » truong cao, trung tam
hoc hieu » hoc thieu, hoc hien, doc hieu
thong tu » phong tuc, thong tin, thong ke
cong van » cong vang, cong san, song van
van than » van thanh, van thang, van tuan
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh ((thong tu) or (trung cap)) trong cong van than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh ((thong tu) OR (trung cap)) trong cong van than cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh ((thong tu) or (trung cap)) trong cong van than cau*.