Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh vi » thanh ve, nhanh vi, thanh vo
thanh va » thanh van, hanh va, thanh ha
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va giao » van giao, va giai, va gia
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: thuoc sach ky nang xa hoi. hieu va giao duc va ((((thanh vi) OR (hanh vi))) or (thanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang xa hoi. hieu va giao duc va ((((thanh vi) OR (hanh vi))) OR (thanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang xa hoi. hieu va giao duc va ((((thanh vi) OR (hanh vi))) or (thanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang xa hoi. hieu va giao duc va ((((thanh vi) OR (hanh vi))) or (thanh va)) cua tre*.