Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ve thanh » le thanh, de thanh, den thanh
so sach » so sanh, bo sach, co sach
sach tu » sach thu, cach tu, sach ty
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano
cuu ve » cuu va

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