Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh oai
thanh tai » thanh hai, thanh toan, doanh tai
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu van
hieu va » lieu va, hieu qua
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ty xang xa hoi. ((hieu ve) or (hieu va)) pham duc va ((thanh vai) OR (thanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty xang xa hoi. ((hieu ve) OR (hieu va)) pham duc va ((thanh vai) OR (thanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty xang xa hoi. ((hieu ve) or (hieu va)) pham duc va ((thanh vai) OR (thanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: so sach ty xang xa hoi. ((hieu ve) or (hieu va)) pham duc va ((thanh vai) OR (thanh tai)) cua te*.