Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
truong va » truong dai, truong cao, truong dao
hoc hieu » hoc thieu, hoc hien, doc hieu
trung va » trang va, trung ha, trung tam
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cao » toan ban, toan tap

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 ((trung va) or (truong va)) nhung cong van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh ((trung va) OR (truong va)) nhung cong van toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh ((trung va) or (truong va)) nhung cong van toan cao*.