Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
trung van » truong van, trung va, trung tuan
trong van » trong cac
dung cong » dung trong
cong tac » cong ty
tac hang » tac vang, bac thang, tac chong
hang cau » hang dau, hang ca, nhung cau
ho hieu » ho chieu, hoi hieu, nho hieu

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 (hoc thieu)) lang - thanh ((trung van) OR (trong van)) dung cong tac hang cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho hieu) OR (hoc thieu)) lang - thanh ((trung van) OR (trong van)) dung cong tac hang cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho hieu) or (hoc thieu)) lang - thanh ((trung van) OR (trong van)) dung cong tac hang cau".
• Adding a wildcard symbol may retrieve word variants: ((ho hieu) or (hoc thieu)) lang - thanh ((trung van) OR (trong van)) dung cong tac hang cau*.