Perhaps you should try some spelling variations:
thong tuong » thong thuong, thong thong, thong duong
thiet danh » thien danh, thien anh, thien dang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
tuong dan » huong dan, tung dan, xuong 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 danh - thanh ((trung cua) or (trung cap)) thong tuong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet danh - thanh ((trung cua) OR (trung cap)) thong tuong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - thanh ((trung cua) or (trung cap)) thong tuong dan than cau*.