Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang vai » hang tai, hang hai, hang vi
ban hang » ngan hang
pham cuc » pham chuc, pham duc, pham cua
cham cuu » cap cuu, chat cua
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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 y ((lang xa) or (hang va)) hoi. hieu va ((cham cuu) or (pham cuc)) ban hang vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((lang xa) OR (hang va)) hoi. hieu va ((cham cuu) OR (pham cuc)) ban hang vai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((lang xa) or (hang va)) hoi. hieu va ((cham cuu) or (pham cuc)) ban hang vai cua tre*.