Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh oai
thanh tai » thanh hai, thanh toan, doanh tai
cham cuu » cap cuu, chat cua
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va
xang xa » lang xa, mang xa, ang xa
cua tre » cua te, cuu tre, cua triet

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 xang xa hoi. ((hieu ve) OR (hieu van)) cham cuu van ((thanh vai) or (thanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang xa hoi. ((hieu ve) OR (hieu van)) cham cuu van ((thanh vai) OR (thanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty xang xa hoi. ((hieu ve) OR (hieu van)) cham cuu van ((thanh vai) or (thanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty xang xa hoi. ((hieu ve) OR (hieu van)) cham cuu van ((thanh vai) or (thanh tai)) cua tre*.