Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
hieu xanh » chieu xanh, hieu manh, hieu nganh
trinh vat » trinh van, trinh luat, sinh vat
nang cong » nang song, dang cong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
cong san » cong tac
san tuan » van tuan, san luan, san quan
tuan thu » toan thuc, van thu

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: doc hieu xanh - hanh ((trinh vat) OR (trinh quan)) nang cong san tuan thu~.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((trinh vat) or (trinh quan)) nang cong san tuan thu*.