Perhaps you should try some spelling variations:
hieu cach » hieu cac, chieu sach, hieu ca
manh tung » manh hung, thanh tung
hoc hieu » hoc thieu, hoc hien, doc hieu
tung chu » hung chu, luong chu, cung chua
chu bang » thu bang, chuc nang, chu quang
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
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 - manh tung chu bang ((((cong tan) OR (cong san))) or (huong dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu cach - manh tung chu bang ((((cong tan) OR (cong san))) OR (huong dan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cach - manh tung chu bang ((((cong tan) OR (cong san))) or (huong dan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cach - manh tung chu bang ((((cong tan) OR (cong san))) or (huong dan)) toan cao*.