Perhaps you should try some spelling variations:
thanh nhan » thanh phan, thanh san, thanh toan
cach thoi » cac thoi, cach thuc, cach noi
dan trung » doan trung, dang trung, danh trung
trung hoc » trung quoc
thoi tap » toi tap, hoc tap, thoi dai
nhan dan » phan dau, gian dan, nhan tai
tu cach » tu cac
mo hoc » mon hoc, co hoc
ma hoi » mai hoi, ma hoa, me hoi

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 thoi tap, nghien cuu mo hoc dan trung hoc ((ma hoi) or (xa hoi)) thanh nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach thoi tap, nghien cuu mo hoc dan trung hoc ((ma hoi) OR (xa hoi)) thanh nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu cach thoi tap, nghien cuu mo hoc dan trung hoc ((ma hoi) or (xa hoi)) thanh nhan dan*.