Perhaps you should try some spelling variations:
thanh trung » thanh tung
hang cong » dang cong, hang nong, bang cong
ho thiet » hoc thiet, hoa thiet, hoc thieu
so thiet » soc thiet, hoc thiet, hoa thiet
trung ve » trung va, trung vu, trung vi
cong san » cong tac
than cau » phan cau, than cap, thanh chau
toan cau » toan cao, toan ban, toan tap
ve hang » ve hoang, ve chang, va hang

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

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