Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (thu sach)) ky ((nang x) or (dang xay)) hoi. lieu va cam xuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky ((nang x) OR (dang xay)) hoi. lieu va cam xuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky ((nang x) or (dang xay)) hoi. lieu va cam xuc va hanh vi cua tre*.