Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
hoi thanh » hoc thanh, hai thanh, hoa thanh
cach thoi » cac thoi, cach thuc, cach noi
phan cung » phan cong, phan ung, phan xuong
phan dau » phan tu, hang dau
cung hoc » chung hoc, dung hoc, vung hoc
cach hoc » cach thuc, dich hoc, cac hop
hoc phan » hoc dan, hoc pho
mai hoi » mai khoi, dai hoi, lai hoi
hoc mai » hoc ma, hoc dai, hoc bai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((cach hoc) OR (cach thoi)) tap, nghien cuu mon hoc phan cung hoc mai hoi thanh phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((cach hoc) OR (cach thoi)) tap, nghien cuu mon hoc phan cung hoc mai hoi thanh phan dau".
• Adding a wildcard symbol may retrieve word variants: tu ((cach hoc) OR (cach thoi)) tap, nghien cuu mon hoc phan cung hoc mai hoi thanh phan dau*.