Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
nam xua » nam cua, nam mua, nam qua
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
nam xuc » cam xuc, nam thuc, nam duoc
nang xa » nang x, lang xa, nang ma
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: ((thu sach) or (toc sach)) ky nang xa hoi. thien van ((nam xuc) OR (nam xua)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (toc sach)) ky nang xa hoi. thien van ((nam xuc) OR (nam xua)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (toc sach)) ky nang xa hoi. thien van ((nam xuc) OR (nam xua)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (toc sach)) ky nang xa hoi. thien van ((nam xuc) OR (nam xua)) va hanh vai cua tre*.