Perhaps you should try some spelling variations:
nghien chuc » nghien cuu, nghiem thuc, nghiep thuc
khanh thong » khanh thuong, khanh phong, thanh thuong
thong hoc » thuong hoc, tuong hoc, thong hoa
sach doi » sach hoi, sach moi, sach dao
co khanh » co thanh, o khanh, co hanh
nhan dan » phan dau, gian dan
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
nang co » nang cao, nang doc, nang noi
hoc xa » hoc ma

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 doi tap, nghien chuc nang co khanh thong hoc xa hoi va ((nhan dan) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien chuc nang co khanh thong hoc xa hoi va ((nhan dan) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien chuc nang co khanh thong hoc xa hoi va ((nhan dan) or (nhan tai))*.