Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hang tai » hang va, dung tai
ban hang » ngan hang
phan duc » pham duc, phan tu, phan dau
duc ban » duc tan, duc van, dua ban
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, co sach
nang o » nang co, nang ho, nang ro
cua tu » cua tuc, cua su, cua cu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (so sach)) ky nang o hoi. hieu ve phan duc ban hang tai ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (so sach)) ky nang o hoi. hieu ve phan duc ban hang tai ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (so sach)) ky nang o hoi. hieu ve phan duc ban hang tai ((cua te) or (cua tu))*.