Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hoac khong » hoa khong, hoc khong, hay khong
hoc chieu » hoc thieu, ho chieu, hoc hien
hua khong » hoa khong, cua khong, phuc khong
cong tan » cong tac, cong san, cong thanh
chan cau » can cau, chinh cau, nhanh cau
phan cau » phan dau, phan cac, phan tu

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 - thanh cong ((hua khong) OR (hoac khong)) cong tan ((chan cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - thanh cong ((hua khong) OR (hoac khong)) cong tan ((chan cau) OR (phan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu tinh - thanh cong ((hua khong) OR (hoac khong)) cong tan ((chan cau) or (phan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - thanh cong ((hua khong) OR (hoac khong)) cong tan ((chan cau) or (phan cau))*.