Perhaps you should try some spelling variations:
nganh dong » nganh cong, nhanh dong, nganh nong
dong thuoc » dung thuoc, dang thuoc, don thuoc
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
van tuan » van quan, van ban, anh tuan
tu sach » thu sach, su sach, te sach
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
lai hoi » lai hoa, lai roi, mai hoi
dai hoi » dai hoc, dai hai, dai moi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach hoc tap, nghien cuu mon hoc nganh dong thuoc ((lai hoi) or (dai hoi)) va van tuan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu mon hoc nganh dong thuoc ((lai hoi) OR (dai hoi)) va van tuan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu mon hoc nganh dong thuoc ((lai hoi) or (dai hoi)) va van tuan*.