Perhaps you should try some spelling variations:
thanh tung » thanh cong
tong cong » trong cong, cong cong, dung cong
hoc thai » toc thai, hoc tai, hoc hai
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan tap » toan ban
hoc thi » hoc tai, hoc chi, hoc khi
tung va » trung va, tuong va, dung va
va tong » va thong, va tuong, va trong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thi) or (hoc thai)) thanh - thanh tung va tong cong dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thi) OR (hoc thai)) thanh - thanh tung va tong cong dan toan tap.
• Adding a wildcard symbol may retrieve word variants: ((hoc thi) or (hoc thai)) thanh - thanh tung va tong cong dan toan tap*.