Perhaps you should try some spelling variations:
thien van » thi van
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
sang mai » sang ma, sang tai, lang mai
hieu van » hieu va, lieu va, hieu ve
thanh vi » hanh vi, thanh va, thanh ve
cuu tre » cua tre, cau treo
ky sang » ky nang, ky dang, ky tang
xuc ban » duc ban, cuc ban, quoc ban
mai hoi » mai khoi, dai hoi, lai hoi
cau xuc » cam xuc, cau luc, cau truc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky sang mai hoi. ((hieu van) OR (thien van)) cau xuc ban thanh vi ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky sang mai hoi. ((hieu van) OR (thien van)) cau xuc ban thanh vi ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky sang mai hoi. ((hieu van) OR (thien van)) cau xuc ban thanh vi ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky sang mai hoi. ((hieu van) OR (thien van)) cau xuc ban thanh vi ((cuu tre) or (cau tren))*.