Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
te sach » toc sach
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
y tang » ky tang, 6 tang, 5 tang
7 tang » 6 tang
ma hoi » mai hoi, xa hoi, ma hoa
tam tu » nam tu, cam tu, dam tu
thuc » thu

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 tang) OR (7 tang)) ma hoi. hieu ve ((am thuc) or (tam tu)) va hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y tang) OR (7 tang)) ma hoi. hieu ve ((am thuc) OR (tam tu)) va hanh tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y tang) OR (7 tang)) ma hoi. hieu ve ((am thuc) or (tam tu)) va hanh tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((y tang) OR (7 tang)) ma hoi. hieu ve ((am thuc) or (tam tu)) va hanh tai cuu tre*.