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

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