Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
thanh tung » thanh cong
thong cong » trong cong, tong cong, thong thong
hoc thiet » hoc thieu, hoc hien, toc thieu
cap thong » cap tong, chap thuong, phap thong
tung cap » trung cap, cung cap, thong cap
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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