Perhaps you should try some spelling variations:
nghien thieu » nghiep hieu, nghiep tieu, nguyen thien
hoc nganh » hoc nhanh
cac thanh » bac thanh, cach nhanh, ban thanh
thanh van » thanh san, thanh toan, thanh phan
thieu mo » thieu mot, thieu so, thien mo
sach doi » sach hoi, sach moi, sach dao
nang hoc » nang doc, nang luc, hang hoa
dong hoc » dong co, dong luc
tai khoa » da khoa, noi khoa
khoa cac » hoa cac, khoa cam, khoa can
doi tap » doi tac, doi dap, doi tai
tu sach » thu sach, su sach, te sach
mo hoc » mon hoc, co hoc

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 thieu mo hoc nganh ((nang hoc) or (dong hoc)) tai khoa cac thanh van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien thieu mo hoc nganh ((nang hoc) OR (dong hoc)) tai khoa cac thanh van.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien thieu mo hoc nganh ((nang hoc) or (dong hoc)) tai khoa cac thanh van*.