Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trang » thanh trung, hanh trinh, minh trang
cong thanh » dong thanh, cong trinh, truong thanh
hoc chieu » hoc thieu, ho chieu, hoc hien
cong tan » cong tac, cong san, cong ty
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: hoc chieu tinh - ((hanh trang) or (canh tranh)) va nhung ((cong thanh) OR (cong tan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chieu tinh - ((hanh trang) OR (canh tranh)) va nhung ((cong thanh) OR (cong tan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc chieu tinh - ((hanh trang) or (canh tranh)) va nhung ((cong thanh) OR (cong tan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc chieu tinh - ((hanh trang) or (canh tranh)) va nhung ((cong thanh) OR (cong tan)) toan cao*.