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

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 tinh) 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 tinh) 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 tinh) or (ban thanh)) lai ((cua tre) or (cuu tre))*.