Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thanh toan » thanh hoa, thanh san, tinh toan
von doanh » van doanh, voi doanh, toan doanh
tan thanh » tran thanh, tang thanh, toan thanh
cuu long » cuu cong, cuu tong, cuu nang
long von » luong von, dong von, long van
khoa hoc » hoa hoc
tu sach » thu sach, su sach, tu cach
te sach » toc sach
hai tan » hai van, hai quan
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: ((tu sach) or (te sach)) hoc tap, nghien cuu long von doanh khoa hoc ma hai tan thanh toan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) hoc tap, nghien cuu long von doanh khoa hoc ma hai tan thanh toan.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) hoc tap, nghien cuu long von doanh khoa hoc ma hai tan thanh toan*.