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

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 di ((cua tu) OR (cua su))~.
• 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 di ((cua tu) OR (cua su)).
• 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 di ((cua tu) OR (cua su))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ly hang xa hoi. hieu va cham duc va hang di ((cua tu) OR (cua su))*.