Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
hoc chieu » hoc thieu, ho chieu, hoc hien
chinh cau » chinh chau, chinh can, chinh tai
tranh va » tranh van, trang va, trinh va
cong san » cong tac
chinh ca » chinh ta, chinh va, chinh tai

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

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