Perhaps you should try some spelling variations:
chieu tinh » lieu tinh, chau tinh, kieu tinh
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
trang va » tran van, hang va
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
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) OR (trieu tinh)) - hanh trang va nhung cong tan toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu tinh) OR (trieu tinh)) - hanh trang va nhung cong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu tinh) OR (trieu tinh)) - hanh trang va nhung cong tan toan cao*.