Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va
ca thue » ca thu, ca hue, cuc thue
thue va » thuc va, thuyet va, thuc vat
va hanh » van hanh, va thanh, ban hanh
y hang » ly hang, ty hang, yu hang
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y hang xa hoi. ((hieu va) or (hieu qua)) ca thue va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y hang xa hoi. ((hieu va) OR (hieu qua)) ca thue va hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: doc sach y hang xa hoi. ((hieu va) or (hieu qua)) ca thue va hanh vi cua te*.