Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
sach doi » sach hoi, sach moi, sach dao
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
cam nhan » ca nhan, cam chan, cam nang
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
voi cam » voi cac, voi nam, voi can
ma voi » ba voi, da voi, ma moi

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 doi tap, nghien cuu cong hoc nganh ((khoa hoc) or (hoa hoc)) ma voi cam nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien cuu cong hoc nganh ((khoa hoc) OR (hoa hoc)) ma voi cam nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien cuu cong hoc nganh ((khoa hoc) or (hoa hoc)) ma voi cam nhan dan*.