Perhaps you should try some spelling variations:
thanh trung » thanh tung
hoc thiet » hoc thuyet, hoc hien, toc thieu
hoc thieu » toc thieu, hoc hien
trung vap » trung cap, trung va, trung van
hang cong » dang cong, hang nong, bang cong
thanh cap » thanh lap, than cap, thanh ca
vap hang » van hang, va hang, van khang
cong san » cong tac
hanh cap » hanh cac, hanh cat, hanh cad

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thiet) OR (hoc thieu)) tach - thanh trung vap hang cong san ((thanh cap) or (hanh cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thieu)) tach - thanh trung vap hang cong san ((thanh cap) OR (hanh cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc thieu)) tach - thanh trung vap hang cong san ((thanh cap) or (hanh cap))".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) OR (hoc thieu)) tach - thanh trung vap hang cong san ((thanh cap) or (hanh cap))*.