Perhaps you should try some spelling variations:
thieu sang » chieu sang, thieu khang, thieu quang
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thieu » toc thieu, hoc hien
cong tang » cong thang, cong lang, cong vang
cua dung » cua dang, cua dong, qua dung
cong tan » cong tac, cong san, cong thanh
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 thieu sang - hanh tranh ((cua dung) or (cua cong)) ((cong tan) or (cong tang)) than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - hanh tranh ((cua dung) OR (cua cong)) ((cong tan) OR (cong tang)) than cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - hanh tranh ((cua dung) or (cua cong)) ((cong tan) or (cong tang)) than cao*.