Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cac tac » cac toc, cac dac, cac tai
cac bac » cac bai, cac ban, cac cach
van bat » van ban, van bao, van bac
bat cua » ban cua, mat cua, bai cua
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. lieu va ((cac tac) or (cac bac)) va van bat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. lieu va ((cac tac) OR (cac bac)) va van bat cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. lieu va ((cac tac) or (cac bac)) va van bat cua tre*.