Perhaps you should try some spelling variations:
te sach » toc sach
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cua triet, dua tren
va danh » va dinh, va dan, dia danh
cuu tre » cau tren, cau treo
cam duc » cam xuc, cao duc, pham duc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
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: te sach y nang ma hoi. hieu va cam duc ((va hanh) or (va danh)) hai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu va cam duc ((va hanh) OR (va danh)) hai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu va cam duc ((va hanh) or (va danh)) hai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu va cam duc ((va hanh) or (va danh)) hai ((cua tre) OR (cuu tre))*.