Perhaps you should try some spelling variations:
hanh cat » hanh cac, hanh luat, nhanh cay
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tac, cac nuoc
va hanh » van hanh, va thanh, va danh
cat cuu » cap cuu, chat cua, cham cuu
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
cac tu » cac thu, cach tu, cac du

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