Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thieu » toc thieu, hoc hien
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
tranh va » tranh van, trang va, trinh va
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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: ((hoc thieu) OR (theo chieu)) tinh - hanh tranh va ((tong cong) OR (dung cong)) dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (theo chieu)) tinh - hanh tranh va ((tong cong) OR (dung cong)) dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (theo chieu)) tinh - hanh tranh va ((tong cong) OR (dung cong)) dan toan cau*.