Perhaps you should try some spelling variations:
tieu tinh » trieu tinh, tieu trinh, lieu tinh
hang hang » nang hang, cang thang, hung thang
cua trung » cua truong, xuan trung, cua nhung
cong manh » duong manh, cong thanh, hoang manh
cong danh » cuong danh, cong dan, cong thanh
hang cua » mang cua, hang ca, huong cua
toan co » toan cao, toan ho, toan hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu tinh - hang hang cua trung ((cong manh) or (cong danh)) toan co~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu tinh - hang hang cua trung ((cong manh) OR (cong danh)) toan co*.