Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
toc sach » hoc sach, doc sach, thuoc sach
sach dao » lanh dao
khoa hoc » hoa hoc
gian dan » gian lang
nhan tai » hang tai, van tai, toan tai
dao tap » dao tao, dao tay, dao gap
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach dao tap, nghien cuu mot hoc nganh khoa hoc ma hoi va ((gian dan) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach dao tap, nghien cuu mot hoc nganh khoa hoc ma hoi va ((gian dan) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: toc sach dao tap, nghien cuu mot hoc nganh khoa hoc ma hoi va ((gian dan) or (nhan tai))*.