Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
nhung cong » dung cong, thong cong, hang cong
theo lieu » theo chieu, theo yeu, thi lieu
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, huong dan
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo lieu) or (theo tieu)) tinh - canh trinh va nhung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo lieu) OR (theo tieu)) tinh - canh trinh va nhung cong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: ((theo lieu) or (theo tieu)) tinh - canh trinh va nhung cong dan toan cau*.