Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
dang mau » dong mau, dang van, dang su
te sach » toc sach
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
mau hoi » cau hoi, mai hoi, mau ho
ky dang » ky nang, ky danh
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam
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: ((te sach) or (doc sach)) ky dang mau hoi. hieu ((ve cam) or (vu cham)) xuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (doc sach)) ky dang mau hoi. hieu ((ve cam) OR (vu cham)) xuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (doc sach)) ky dang mau hoi. hieu ((ve cam) or (vu cham)) xuc va hanh vi cua tre*.