Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
va hanh » van hanh, va thanh, ban hanh
doi cuu » doi cua, doi cuoc
va danh » va dinh, va dan, dia danh
nam tuc » nam thuc, nam truc, nam tu
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
cuu tre » cua tre, cau tren, cau treo
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 mai hoi. ((hieu van) or (hieu va)) nam tuc ((va hanh) OR (va danh)) doi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang mai hoi. ((hieu van) OR (hieu va)) nam tuc ((va hanh) OR (va danh)) doi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang mai hoi. ((hieu van) or (hieu va)) nam tuc ((va hanh) OR (va danh)) doi cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang mai hoi. ((hieu van) or (hieu va)) nam tuc ((va hanh) OR (va danh)) doi cuu tre*.