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