Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
trung tuan » trung thanh, trung tam, tran tuan
hoc thiet » hoc thieu, hoc hien, toc thieu
trung cap » truong cao, trung tam
cong san » cong tac
san toan » van toan, dan toan, manh toan
toan tap » toan ban

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 thuyet)) tach - thanh ((trung cap) or (trung tuan)) trong cong san toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thuyet)) tach - thanh ((trung cap) OR (trung tuan)) trong cong san toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc thuyet)) tach - thanh ((trung cap) or (trung tuan)) trong cong san toan tap".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) OR (hoc thuyet)) tach - thanh ((trung cap) or (trung tuan)) trong cong san toan tap*.