Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cai
va cao » va cac, va co, va bao
va dao » ca dao
dao di » dao do, dao du, dao li
di cua » dai cua, doi cua, de cua

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