Perhaps you should try some spelling variations:
hien sang » hien trang, khien bang, chieu sang
canh manh » lanh manh, canh tranh, cach mang
hong bang » dong bang, hang ban, hong hanh
manh cua » doanh cua, ban cua
cua hang » cua dang, cua nhung, cua cong
cong ban » cong bang, cong san, cong tan
than cao » toan cao, thai cao, 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 hien sang - canh manh cua hang ((cong ban) or (hong bang)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien sang - canh manh cua hang ((cong ban) OR (hong bang)) than cao.
• Adding a wildcard symbol may retrieve word variants: hoc hien sang - canh manh cua hang ((cong ban) or (hong bang)) than cao*.