Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong thuoc » khang thuoc, hong phuoc, dong thuoc
thuoc xa » thuoc ma, thuoc va, thuoc la
phan dan » phan dang, phan dau, nhan dan
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu trac » tu truc, ty trach, tap trac
mot hoc » mo hoc, mot goc, bot hoc
mon hoc » toan hoc, dong hoc
va phan » van phan, va phat, va phap

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 tu trac, nghien cuu ((mot hoc) or (mon hoc)) nganh khong thuoc xa hoi va phan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu trac, nghien cuu ((mot hoc) OR (mon hoc)) nganh khong thuoc xa hoi va phan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach tu trac, nghien cuu ((mot hoc) or (mon hoc)) nganh khong thuoc xa hoi va phan dan*.