Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
cac truc » cau truc, cac tru, cac trung
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, van bac
truc va » thuc va, thuc vat, trung va
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
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: ((thu hoach) or (thuoc sach)) ky nang xa hoi. hieu van cac truc va dan dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuoc sach)) ky nang xa hoi. hieu van cac truc va dan dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuoc sach)) ky nang xa hoi. hieu van cac truc va dan dai cua tre*.