Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
te sach » toc sach
vai cuu » vai cua
va hanh » van hanh, va danh, ban hanh
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
co tuc » co thuc, co tu, co toc
x hoi » xa hoi, o hoi, x ho
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)) x hoi. hieu ve co tuc ((va hanh) OR (va thanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((tu nang) OR (truc nano)) x hoi. hieu ve co tuc ((va hanh) OR (va thanh)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((tu nang) or (truc nano)) x hoi. hieu ve co tuc ((va hanh) OR (va thanh)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((tu nang) or (truc nano)) x hoi. hieu ve co tuc ((va hanh) OR (va thanh)) vai cuu tre*.