Perhaps you should try some spelling variations:
thien van » thi van
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
thanh va » thanh van, hanh va, thanh ha
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
xuc van » duc van, luc van, vuc van
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: ((toc sach) OR (doc sach)) ky nang xa hoi. thien van cam xuc van ((thanh va) or (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) ky nang xa hoi. thien van cam xuc van ((thanh va) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) ky nang xa hoi. thien van cam xuc van ((thanh va) or (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) ky nang xa hoi. thien van cam xuc van ((thanh va) or (hanh vi)) cua tre*.