Perhaps you should try some spelling variations:
thuoc doanh » thuoc dang, thuoc dong, thuoc thanh
thuoc sach » hoc sach, nuoc sach, thuat sach
nang thuoc » dang thuoc, nang thuc, sang thuoc
doanh khoa » toan khoa
van giang » manh giang, tran giang, dan gian
giang dan » gian dan, giang day, giang van
cuu nang » chuc nang, cam nang, cuu van
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach
hoi van » hoi va, hoi dan, hai van
hoc xa » hoc ma

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 (thuoc sach)) hoc tap, nghien cuu nang thuoc doanh khoa hoc xa hoi van giang dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) hoc tap, nghien cuu nang thuoc doanh khoa hoc xa hoi van giang dan.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) hoc tap, nghien cuu nang thuoc doanh khoa hoc xa hoi van giang dan*.