Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hanh sinh » hanh tinh, hanh dinh, hinh sinh
ban cong » bang cong, van cong, phan cong
cong san » cong tac
than cap » thanh lap, thanh cac, than cua
khan cap » khan ap, khoan cam, phan cac
sinh va » sinh vat, tinh va, dinh van
va ban » van ban, va bai, va bao

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: toc thieu xanh - hanh sinh va ban cong san ((than cap) OR (khan cap))~.
• Adding a wildcard symbol may retrieve word variants: toc thieu xanh - hanh sinh va ban cong san ((than cap) or (khan cap))*.