Perhaps you should try some spelling variations:
thanh trung » thanh tung
ho chieu » theo chieu, hoc thieu, doi chieu
hoc tang » hoc bang, hoc tieng, hoc trong
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap
ho hieu » hoi hieu, nho hieu, co hieu
hoc tan » hoc dan, hoc tap, hoc tai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho hieu) OR (ho chieu)) quang - thanh trung ((hoc tang) or (hoc tan)) cong tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (ho chieu)) quang - thanh trung ((hoc tang) OR (hoc tan)) cong tac than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) OR (ho chieu)) quang - thanh trung ((hoc tang) or (hoc tan)) cong tac than cau".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) OR (ho chieu)) quang - thanh trung ((hoc tang) or (hoc tan)) cong tac than cau*.