Perhaps you should try some spelling variations:
hanh luat » nganh luat, hang luan, hanh lam
cau tren » cu tren, dau tren, ca tren
luat cau » luat dau, lua cau, luat cac
mai hoi » mai khoi, dai hoi, lai hoi
cac tac » cac toc, cac bac, cac dac
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
ma hoi » xa hoi, ma hoa, me hoi
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang

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