Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
thanh nhan » thanh phan, thanh san, doanh nhan
thanh toan » thanh hoa, thanh san, tinh toan
cac nganh » hoc nganh
sach hoc » cach hoc, sach hoi, mach hoc
cuu long » cuu cong, cuu tong, cuu nang
long cac » luong cac, cong cac, dong cac
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa 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 sach hoc tap, nghien cuu long cac nganh khoa hoc xa hai van ((thanh nhan) or (thanh toan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu long cac nganh khoa hoc xa hai van ((thanh nhan) OR (thanh toan)).
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu long cac nganh khoa hoc xa hai van ((thanh nhan) or (thanh toan))*.