Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cuu tre » cau tren, cau treo
ty hang » ly hang, ty xang, thi hang
ve cac » vien cac
hang x » nang x, hoang xa, chang xu
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: vu sach ty hang x hoi. hieu ((ve cac) or (va cac)) duc va hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty hang x hoi. hieu ((ve cac) OR (va cac)) duc va hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty hang x hoi. hieu ((ve cac) or (va cac)) duc va hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach ty hang x hoi. hieu ((ve cac) or (va cac)) duc va hanh vi ((cua tre) OR (cuu tre))*.