Perhaps you should try some spelling variations:
nganh khong » nganh cong, nhanh chong, nganh nong
khong thuoc » khang thuoc, hong phuoc, dong thuoc
goc nganh » hoc nganh, hoc nhanh, cac nganh
sach tap » sach cap, sach tai, sach tham
tap trac » tap toan
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
va nhan » van nhan, ca nhan, va phan
mo goc » mot goc, mo hoc, mo uoc
la hoi » lai hoi, le hoi, va hoi

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