Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
dau dai » dat dai, sau dai, dau da
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
va chat » van chat, va phat, cao chat
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
va cao » va cac, va co, va bao
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ly nang xa hoi. hieu ((va chat) or (((va cao) OR (va dao)))) thuc va dau dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang xa hoi. hieu ((va chat) OR (((va cao) OR (va dao)))) thuc va dau dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ly nang xa hoi. hieu ((va chat) or (((va cao) OR (va dao)))) thuc va dau dai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang xa hoi. hieu ((va chat) or (((va cao) OR (va dao)))) thuc va dau dai cua tre*.