Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
doc sach » hoc sach, toc sach, dac sac
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
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) or (((doc sach) or (nuoc sach)))) ky nang xa hoi. hieu ve cac tuc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((doc sach) OR (nuoc sach)))) ky nang xa hoi. hieu ve cac tuc va hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((doc sach) or (nuoc sach)))) ky nang xa hoi. hieu ve cac tuc va hanh di cua tre*.