Perhaps you should try some spelling variations:
thuat sach » thuat san
thuat lanh » thuat lap, thuat san
nhan thong » nhan trong, nha thong, nhan khong
thong hoc » thuong hoc, tuong hoc, thong hoa
van thanh » ban thanh, van tuan
thanh van » thanh san, thanh toan, thanh phan
hoc nhan » hoc nhanh, nhoc nhan, hoc phan
hoi tai » hoc tai, hoi trac
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
ha van » hoa van, nha van, va van
ma ha » ma hoa, mai ha, my ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (thuat lanh)) hoi tai, nghien cuu mon hoc nhan thong hoc ma ha van thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (thuat lanh)) hoi tai, nghien cuu mon hoc nhan thong hoc ma ha van thanh van.
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (thuat lanh)) hoi tai, nghien cuu mon hoc nhan thong hoc ma ha van thanh van*.