Perhaps you should try some spelling variations:
hoc thieu » toc thieu
tranh van » tran van, trinh van, thanh van
cong cong » cong dong, trong cong, dung cong
van cong » van dong, van phong, phan cong
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hien) or (hoc thieu)) xanh - canh tranh van cong cong san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (hoc thieu)) xanh - canh tranh van cong cong san toan tap.
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (hoc thieu)) xanh - canh tranh van cong cong san toan tap*.