Perhaps you should try some spelling variations:
chua nang » chuc nang, chua xang, kha nang
ngan khoa » nganh khoa, nhan khoa, nhuan khoa
sach doi » sach hoi, sach moi, sach dao
cuu nang » chuc nang, cam nang, cuu van
luc ngan » luc nganh, luc nhan, luat ngan
khoa hoc » hoa hoc
hang tai » hang va, dung tai
so sach » so sanh, bo sach, co sach
doi tap » doi tac, doi dap, doi tai
va hang » van hang, va nang, va lang
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: so sach doi tap, nghien ((cuu nang) or (chua nang)) luc ngan khoa hoc xa hoi va hang tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach doi tap, nghien ((cuu nang) OR (chua nang)) luc ngan khoa hoc xa hoi va hang tai.
• Adding a wildcard symbol may retrieve word variants: so sach doi tap, nghien ((cuu nang) or (chua nang)) luc ngan khoa hoc xa hoi va hang tai*.