Perhaps you should try some spelling variations:
nghien thieu » nghiep hieu, nghiep tieu, nguyen thien
thieu mot » hieu mot, thieu so, hieu moi
hoc nganh » hoc nhanh
sach hoc » cach hoc, sach hoi, mach hoc
nong hoc » nang hoc, nong thon, duong hoc
dong hoc » dong co, dong luc
tai khoa » da khoa, noi khoa
khoa cam » khoan cam, khoa kham, khoa ma
cam tinh » cham tinh, cac tinh, ca tinh
tu sach » thu sach, su sach, te sach
mot hoc » mon hoc, mo hoc, mot goc
toan » tran

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, nghien thieu mot hoc nganh ((nong hoc) or (dong hoc)) tai khoa cam tinh toan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien thieu mot hoc nganh ((nong hoc) OR (dong hoc)) tai khoa cam tinh toan.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien thieu mot hoc nganh ((nong hoc) or (dong hoc)) tai khoa cam tinh toan*.