Perhaps you should try some spelling variations:
hieu cach » hieu cac, chieu sach, hieu ca
hanh tram » hanh trang, thanh tran, thanh tra
van nhung » van nhuong, va nhung, van hung
hoc hieu » hoc thieu, hoc hien, doc hieu
hanh tam » thanh tam, nhanh tam, hanh lam
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cau » 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 hieu cach - ((hanh tram) or (hanh tam)) van nhung ((cong dan) or (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - ((hanh tram) OR (hanh tam)) van nhung ((cong dan) OR (cong tan)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - ((hanh tram) or (hanh tam)) van nhung ((cong dan) or (cong tan)) toan cau*.