Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
luat cua » luat sua, xuat cua, lua cua
luat cuu » luat cau, luat tuc, luat dau
va hanh » van hanh, va thanh, va danh
cac tac » cac toc, cac bac, cac dac
cac tuc » cac toc, cac tu, cac nuoc
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y nang ma hoi. hieu qua ((cac tuc) or (cac tac)) va hanh ((luat cuu) OR (luat cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ma hoi. hieu qua ((cac tuc) OR (cac tac)) va hanh ((luat cuu) OR (luat cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ma hoi. hieu qua ((cac tuc) or (cac tac)) va hanh ((luat cuu) OR (luat cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ma hoi. hieu qua ((cac tuc) or (cac tac)) va hanh ((luat cuu) OR (luat cua)) tre*.