Perhaps you should try some spelling variations:
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
thu tinh » thue tinh, thuy tinh, thuc tinh
tinh hoc » sinh hoc, tin hoc, hinh hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
ban soan » bien soan, ban doanh, nang soan
hai van » thai van, ha van, hai tan
ban san » ban dan, ban can, ban sac
ma hai » ta hai, va hai, xa hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu tinh hoc tap, nghien cuu dong hoc khanh hoa hoc ma hai van ((ban san) or (ban soan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu tinh hoc tap, nghien cuu dong hoc khanh hoa hoc ma hai van ((ban san) OR (ban soan)).
• Adding a wildcard symbol may retrieve word variants: thu tinh hoc tap, nghien cuu dong hoc khanh hoa hoc ma hai van ((ban san) or (ban soan))*.