Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
thi hanh » thi thanh
va thanh » gia thanh, va tinh, le thanh
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
thi van » thi lan, thi nang
lap cua » lai cua, tap cua, lam cua
nang o » nang co, nang ho, nang ro
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: toc sach ky nang o hoi. ((thi van) or (thi hanh)) bac xuc ((va thanh) or (ban thanh)) lap cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky nang o hoi. ((thi van) OR (thi hanh)) bac xuc ((va thanh) OR (ban thanh)) lap cua viet.
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang o hoi. ((thi van) or (thi hanh)) bac xuc ((va thanh) or (ban thanh)) lap cua viet*.