Perhaps you should try some spelling variations:
nghiep thuc » nghiem thuc, nghiem thuoc, nghe thuc
nganh khoa » nganh hoa, nganh khong, doanh khoa
thuc cong » thuoc cong, thu cong, chuc cong
cac nganh » hoc nganh
sach hoc » cach hoc, sach hoi, mach hoc
cong cac » cuong cac, cong tac, cong cau
khoa hoc » hoa hoc
cac pham » tac pham, cac phan, cau pham
tu sach » thu sach, su sach, te sach
cac ham » cac cam, cac hat, cac nhan
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 hoc tap, nghiep thuc cong cac nganh khoa hoc xa hoi ((cac pham) or (cac ham)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghiep thuc cong cac nganh khoa hoc xa hoi ((cac pham) OR (cac ham)) van.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghiep thuc cong cac nganh khoa hoc xa hoi ((cac pham) or (cac ham)) van*.