Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » thien van, lieu va, hieu ve
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
hanh hu » hanh khu, hanh nhu, hanh tu
cua tre » cuu tre, cua triet, dua tren
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

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