Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
khoa hoc » hoa hoc
phan dau » phan tu, hang dau
doi tap » doi tac, doi dap, doi tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
va phan » van phan, va phat, va phap
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (doc sach)) doi tap, nghien cuu mon hoc nganh khoa hoc ma hoi va phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) doi tap, nghien cuu mon hoc nganh khoa hoc ma hoi va phan dau.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) doi tap, nghien cuu mon hoc nganh khoa hoc ma hoi va phan dau*.