Perhaps you should try some spelling variations:
trinh quan » trinh luat, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
hoi hieu » hoi phieu, hoi tieu, moi hieu
ban cong » bang cong, van cong, phan cong
cong tac » cong ty
tac tran » tan tran, tac trai, tac tren
tran cau » tran chau, toan cau, ran cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoi hieu lang - hanh ((trinh quan) OR (tinh quang)) ban cong tac tran cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi hieu lang - hanh ((trinh quan) OR (tinh quang)) ban cong tac tran cau*".