Perhaps you should try some spelling variations:
hanh luat » nganh luat, hang luan, hanh lam
luat cuu » luat cau, luat cua, luat tuc
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
cac bac » cac bai, cac ban, cac cach
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
sach v » sach va, sach y, sach 2

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 v ((nang xa) OR (nang x)) hoi. hieu qua ((cac du) or (cac bac)) va hanh luat cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v ((nang xa) OR (nang x)) hoi. hieu qua ((cac du) OR (cac bac)) va hanh luat cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v ((nang xa) OR (nang x)) hoi. hieu qua ((cac du) or (cac bac)) va hanh luat cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach v ((nang xa) OR (nang x)) hoi. hieu qua ((cac du) or (cac bac)) va hanh luat cuu tre*.