Perhaps you should try some spelling variations:
phuong thong » phuong trong, thong thong, phuong hoang
thanh trung » thanh tung
tien thanh » tien thinh, tran thanh, den thanh
cua phuong » cuu phuong, cuc phuong, luan phuong
tien manh » tien anh, tieng anh, tran manh
trung cua » truong cua, trung tuan, trung cap
tap toan » tap doan, bai toan
tap quan » tac quan, hai quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((tien manh) or (tien thanh)) - thanh trung cua phuong thong ((tap toan) OR (tap quan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((tien manh) OR (tien thanh)) - thanh trung cua phuong thong ((tap toan) OR (tap quan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((tien manh) or (tien thanh)) - thanh trung cua phuong thong ((tap toan) OR (tap quan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((tien manh) or (tien thanh)) - thanh trung cua phuong thong ((tap toan) OR (tap quan)) cao*.