Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
thieu sang » chieu sang, thieu khang, thieu quang
hoc thieu » toc thieu, hoc hien
cong manh » cong danh, duong manh, hoang manh
tranh va » tranh van, trang va, trinh va
toan cao » toan ban, toan tap
va nang » van nang, da nang, cam nang

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 - canh tranh va nang ((cong manh) or (cong thanh)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu sang - canh tranh va nang ((cong manh) OR (cong thanh)) toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc thieu sang - canh tranh va nang ((cong manh) or (cong thanh)) toan cao*.