Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
va thanh » gia thanh, va tinh, le thanh
cua tre » cua te, cua triet, dua tren
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu va, hieu van
nano xa » nano va, nano bac, nano cau
tu nano » truc nano
cuu tre » cau tren, cau treo
dam tu » nam tu, cam tu, tam tu
ve dam » ven dam, ke dam, va dam

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach tu nano xa hoi. hieu ve dam tu ((va thanh) OR (ban thanh)) lai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu nano xa hoi. hieu ve dam tu ((va thanh) OR (ban thanh)) lai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tu nano xa hoi. hieu ve dam tu ((va thanh) OR (ban thanh)) lai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sach tu nano xa hoi. hieu ve dam tu ((va thanh) OR (ban thanh)) lai ((cua tre) or (cuu tre))*.