Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien nang » thien bang, thien dang, trien nang
van hanh » van thanh, ban hanh, van anh
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, va cam, ve cai
di cua » dai cua, doi cua, de cua
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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 thien nang x hoi. hieu ((ve cam) or (ve cac)) xuc ((va thanh) or (van hanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thien nang x hoi. hieu ((ve cam) OR (ve cac)) xuc ((va thanh) OR (van hanh)) di cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach thien nang x hoi. hieu ((ve cam) or (ve cac)) xuc ((va thanh) or (van hanh)) di cua tre*.