Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham duc » pham duc, cham soc, pham duy
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
va cham » va chat, va tham
va hang » van hang, va nang, va lang
vai cua » dai cua, hai cua, lai cua
vi cua » di cua

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 ly hang xa hoi. hieu va cham duc va hang ((vi cua) or (vai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly hang xa hoi. hieu va cham duc va hang ((vi cua) OR (vai cua)) tu.
• Adding a wildcard symbol may retrieve word variants: toc sach ly hang xa hoi. hieu va cham duc va hang ((vi cua) or (vai cua)) tu*.