Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hang » van khang, van hoang, van thang
cham duc » pham duc, cham soc, pham duy
va cham » va chat, va tham
va hang » va nang, va lang, va hanh
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
ly hang » ly quang
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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 (toc sach)) ly hang xa hoi. hieu va cham duc ((va hang) OR (van hang)) di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ly hang xa hoi. hieu va cham duc ((va hang) OR (van hang)) di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ly hang xa hoi. hieu va cham duc ((va hang) OR (van hang)) di cua tu".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ly hang xa hoi. hieu va cham duc ((va hang) OR (van hang)) di cua tu*.