Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
xang xa » lang xa, mang xa, ang xa
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau treo
y xang » ty xang
hieu v » hieu va, hieu ve, hieu 2
v pham » vi pham, d pham

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 y xang xa hoi. hieu v pham duc va hanh vi ((((cua tre) or (cuu tre))) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y xang xa hoi. hieu v pham duc va hanh vi ((((cua tre) OR (cuu tre))) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: su sach y xang xa hoi. hieu v pham duc va hanh vi ((((cua tre) or (cuu tre))) or (cau tren))*.