Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va hanh » van hanh, va thanh, ban hanh
cuu tre » cua tre, cau tren
te sach » toc sach
va danh » va dinh, va dan, dia danh
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac

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

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