Perhaps you should try some spelling variations:
thanh trung » thanh tung
hoc nhiet » hoc thiet, hoc nghien, hoc viet
trong sat » trong san, trong dat, trong sam
trung ha » trung hoc, trung tam, trung cap
phan dau » phan tu, hang dau
hang tai » hang va, dung tai
ha dung » hai dung, kha dung, nha dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc nhiet) OR (hoc hien)) tach - thanh trung ha dung trong sat ((phan dau) or (hang tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc nhiet) OR (hoc hien)) tach - thanh trung ha dung trong sat ((phan dau) OR (hang tai)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc nhiet) OR (hoc hien)) tach - thanh trung ha dung trong sat ((phan dau) or (hang tai))".
• Adding a wildcard symbol may retrieve word variants: ((hoc nhiet) OR (hoc hien)) tach - thanh trung ha dung trong sat ((phan dau) or (hang tai))*.