Perhaps you should try some spelling variations:
te sach » toc sach
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
co thuc » do thuc, co thua, mo thuc
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
cuu tre » cua tre, cau tren, cau treo
va cuu » va cau, va chu, va huu
ve co » vo co, va co, de co

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 ((tu nang) or (truc nano)) xa hoi. hieu ve co thuc ((va hanh) OR (va danh)) va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (truc nano)) xa hoi. hieu ve co thuc ((va hanh) OR (va danh)) va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) or (truc nano)) xa hoi. hieu ve co thuc ((va hanh) OR (va danh)) va cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (truc nano)) xa hoi. hieu ve co thuc ((va hanh) OR (va danh)) va cuu tre*.