Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
trung cap » truong cao
hang cong » dang cong, hang nong, bang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tac » cong ty
tac va » tac da, tac xa, tuc va
va ban » van ban, va bai, va bao

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 - thanh ((trung cap) or (trung tam)) hang cong tac va ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - thanh ((trung cap) OR (trung tam)) hang cong tac va ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - thanh ((trung cap) or (trung tam)) hang cong tac va ban*.