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

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