Perhaps you should try some spelling variations:
dua tren » dung tren
dang xay » dang van, van xay
hieu ket » hieu kem, thien ket, lien ket
cuu tre » cua tre, cau tren, cau treo
hanh de » hanh ve
duc ban » duc tan, duc van, dua ban
cau duc » cao duc, cau luc, chu duc
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
sai ky » sac ky
te sai » te tai, te bai, te lai
kem » kiem

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky dang xay hoi. hieu ket cau duc ban ((hanh de) OR (hanh kem)) ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky dang xay hoi. hieu ket cau duc ban ((hanh de) OR (hanh kem)) ((dua tren) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky dang xay hoi. hieu ket cau duc ban ((hanh de) OR (hanh kem)) ((dua tren) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sai ky dang xay hoi. hieu ket cau duc ban ((hanh de) OR (hanh kem)) ((dua tren) or (cuu tre))*.