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

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