Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
nhanh nong » nhanh dong, nhanh song, nganh nong
hoc nhanh » hoc nganh, hoc phan
sach hoc » cach hoc, sach hoi, mach hoc
tai khoa » da khoa, noi khoa
cau phan » chau phan, cuu phan, cac phan
phan van » pham van, thanh van, luan van
tu sach » thu sach, su sach, te sach
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
xa khoa » da khoa, bia khoa

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien huu mot hoc nhanh nong thon ((xa khoa) OR (tai khoa)) cau phan van~.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien huu mot hoc nhanh nong thon ((xa khoa) or (tai khoa)) cau phan van*.