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