Perhaps you should try some spelling variations:
tien tinh » tien thinh, tien trinh, thien tinh
hoc tien » hoc tieng, hoc hien, hoc vien
van lang » van nang, va lang, van dang
van hang » van khang, van hoang, van thang
cong san » cong tac
phan cau » phan dau, phan tu, phan lap
phan cac » nhan cach, phan dau, phan lap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc tien tinh - canh tranh ((van lang) or (van hang)) cong san ((phan cau) or (phan cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc tien tinh - canh tranh ((van lang) OR (van hang)) cong san ((phan cau) OR (phan cac)).
• Adding a wildcard symbol may retrieve word variants: hoc tien tinh - canh tranh ((van lang) or (van hang)) cong san ((phan cau) or (phan cac))*.