Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
va dan » ca dan, va dao, va dau

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 y nang xa hoi. hieu ((va cam) or (va cao)) thuc va dan dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ((va cam) OR (va cao)) thuc va dan dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ((va cam) or (va cao)) thuc va dan dai cua tre*.