Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
thong cong » trong cong, tong cong, thong thong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thiet anh » thien anh, thuyet anh, thien danh
trung cap » truong cao, trung tam
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

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 anh - thanh ((trung tuan) or (trung cap)) thong cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet anh - thanh ((trung tuan) OR (trung cap)) thong cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet anh - thanh ((trung tuan) or (trung cap)) thong cong dan than cau*.