Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hang hoa » hang khoa, thanh hoa, hang va
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
cau treo » cau theo, cau tren, cau triet
sach ky » sac ky, sach y, sach ty
ky hang » ky nang, ly hang, ky dang
qua cho » qua co, qua kho, qua chu
cua tre » cua te, cuu tre, cua triet
cho xu » chao xu, choi xu, cho xa

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 hang hoa hoc. hieu qua cho xu ((va thanh) or (van hanh)) vi ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky hang hoa hoc. hieu qua cho xu ((va thanh) OR (van hanh)) vi ((cua tre) OR (cau treo)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky hang hoa hoc. hieu qua cho xu ((va thanh) or (van hanh)) vi ((cua tre) or (cau treo))*.