Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
ban hanh » ban hang
te sach » toc sach
hieu va » lieu va, hieu qua
hang ma » hang ca, tang ma, nang ma
luc ban » duc ban, cuc ban, luc bat
vi cua » vai cua, di cua
va coc » va cuoc, va cac, va hoc
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thuoc sach)) ty ((hang ma) OR (hang va)) hoi. hieu va coc luc ban hanh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thuoc sach)) ty ((hang ma) OR (hang va)) hoi. hieu va coc luc ban hanh vi cua su*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thuoc sach)) ty ((hang ma) OR (hang va)) hoi. hieu va coc luc ban hanh vi cua su*".