Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
van chat » cao chat
cau tren » cu tren, dau tren, ca tren
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
van hac » van hoc, van ha, van hai
mang xa » lang xa, mang may, dang xay
ty mang » ty xang, ty hang, tin mang
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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 ty mang xa hoi. hieu ((van hac) or (van chat)) xuc va thanh than ((cau tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty mang xa hoi. hieu ((van hac) OR (van chat)) xuc va thanh than ((cau tren) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ty mang xa hoi. hieu ((van hac) or (van chat)) xuc va thanh than ((cau tren) or (cua tre))*.