Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
sach hoi » sach doi, sach moi, cach thoi
kho tang » cao tang
tang dau » hang dau, xang dau, nang dau
te sach » toc sach
hoi tap » hoi dap, hoc tap, hoi tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hoi kho » hoi khoa, hoi cho, hoi tho

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

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