Perhaps you should try some spelling variations:
chieu ke » hieu ky, hieu ve, hieu kem
truc ban » thuc ban, truc dan, truc van
ban hanh » ban hang
cuu tre » cau tren, cau treo
hanh de » hanh ve, hanh kem
ky tang » ky nang, kho tang, ky trong
cua tre » cua te, cua triet, dua tren
ky dang » ky nang, ky danh
te sac » te sach, te cac, te san
ke cau » ket cau

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

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