Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
thuc day » thuc dan, thuc vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
vu cham » va cham, vu kham, tu cham
thuc va » thuc vat, thuc dan
cua tre » cua te, cuu tre, cua triet

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