Perhaps you should try some spelling variations:
sang mai » sang ma, sang tai, lang mai
hanh tai » thanh tai, hang tai, han tai
cuu tre » cau tren, cau treo
tu cach » tu cac
cach tu » cach thuc
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
tu sang » thu sang, tu san, tu lang
cua tre » cua te, cua triet, dua tren
xuc va » tuc va, luc va, xac va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cach tu sang mai hoi. hieu ve cham ((xuc va) or (duc va)) hanh tai ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cach tu sang mai hoi. hieu ve cham ((xuc va) OR (duc va)) hanh tai ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cach tu sang mai hoi. hieu ve cham ((xuc va) or (duc va)) hanh tai ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: tu cach tu sang mai hoi. hieu ve cham ((xuc va) or (duc va)) hanh tai ((cuu tre) OR (cua tre))*.