Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
nang cong » nang song, dang cong, bang cong
cong manh » cong danh, duong manh, cong thanh
ho chieu » theo chieu, doi chieu, mot chieu
tranh va » tranh van, trang va, trinh va
toan cao » toan ban
toan tap » toan ban
va nang » van nang, da nang, cam nang

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - canh tranh va nang cong manh ((toan cao) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) xanh - canh tranh va nang cong manh ((toan cao) or (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) xanh - canh tranh va nang cong manh ((toan cao) or (toan tap))*.