Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
goc nganh » hoc nganh, hoc nhanh, cac nganh
sach hoc » cach hoc, sach hoi, mach hoc
khoa hoc » hoa hoc
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, cuu mo, huu mot
va nhan » van nhan, ca nhan, va phan
ma hoi » mai hoi, ma hoa, me 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 hoc tap, nghien cuu mot goc nganh khoa hoc ((ma hoi) or (xa hoi)) va nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach hoc tap, nghien cuu mot goc nganh khoa hoc ((ma hoi) OR (xa hoi)) va nhan tai.
• Adding a wildcard symbol may retrieve word variants: tu sach hoc tap, nghien cuu mot goc nganh khoa hoc ((ma hoi) or (xa hoi)) va nhan tai*.