Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cach thoi » cac thoi, cach noi
pho khong » pho thong, nho khong, phong khong
khong hoc » khung hoc, thong hoc, khong thuoc
dai khoi » dai hoi, dai khoa, mai khoi
nhan van » nhan dan, nhan va, phan van
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoc dai » hoc dan
khoi va » hoi va, khi va, choi va
va nhan » van nhan, ca nhan, va phan

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 thuc) or (cach thoi)) tap, nghien cuu mon hoc pho khong hoc dai khoi va nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((cach thuc) OR (cach thoi)) tap, nghien cuu mon hoc pho khong hoc dai khoi va nhan van.
• Adding a wildcard symbol may retrieve word variants: tu ((cach thuc) or (cach thoi)) tap, nghien cuu mon hoc pho khong hoc dai khoi va nhan van*.