Perhaps you should try some spelling variations:
nganh cong » nhanh chong, thanh cong
cong thuoc » cong thuc, dong thuoc, long thuoc
sach hoc » cach hoc, sach hoi, mach hoc
dong luc » nang luc
thuoc xa » thuoc ma, thuoc va, thuoc la
hang tai » hang va, dung tai
so sach » so sanh, bo sach, co sach
va hang » van hang, va nang, va lang

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 hoc tap, nghien cuu ((dong co) or (dong luc)) nganh cong thuoc xa hoi va hang tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoc tap, nghien cuu ((dong co) OR (dong luc)) nganh cong thuoc xa hoi va hang tai.
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien cuu ((dong co) or (dong luc)) nganh cong thuoc xa hoi va hang tai*.