Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
truc ban » thuc ban, truc dan, truc van
ban hanh » ban hang
ky lang » ky dang, ky tang, tay lang
hieu ke » hieu kem, chieu ke, hieu ky
hanh de » hanh ve, hanh kem
cuu tre » cua tre, cau tren, cau treo
te sai » te tai, te bai, te lai
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 sai ((ky lang) or (ky nang)) xa hoi. hieu ke cau truc ban hanh de ((cua triet) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ((ky lang) OR (ky nang)) xa hoi. hieu ke cau truc ban hanh de ((cua triet) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sai ((ky lang) or (ky nang)) xa hoi. hieu ke cau truc ban hanh de ((cua triet) or (cuu tre))*.