Perhaps you should try some spelling variations:
te sach » toc sach
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ky danh » ky anh
ky dang » ky nang
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua
ve cam » ve cham, ve cac, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ky dang) or (ky danh)) xa hoi. hieu ((ve cam) OR (va cam)) luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky dang) OR (ky danh)) xa hoi. hieu ((ve cam) OR (va cam)) luc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky dang) or (ky danh)) xa hoi. hieu ((ve cam) OR (va cam)) luc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky dang) or (ky danh)) xa hoi. hieu ((ve cam) OR (va cam)) luc va hanh vi cua tre*.