Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh vai » hanh vi, hanh va, hanh tai
cau luc » cau phuc
vai cuu » vai cua
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu van
hieu va » lieu va, hieu qua
cao hoi » cau hoi, co hoi, cao hoc
y nang » ky nang, ly nang, v nang

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 y nang cao hoi. ((hieu ve) or (hieu va)) ((cau luc) OR (cau truc)) va hanh vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang cao hoi. ((hieu ve) OR (hieu va)) ((cau luc) OR (cau truc)) va hanh vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang cao hoi. ((hieu ve) or (hieu va)) ((cau luc) OR (cau truc)) va hanh vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang cao hoi. ((hieu ve) or (hieu va)) ((cau luc) OR (cau truc)) va hanh vai cuu tre*.