Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
truc van » truc va, thuc van, truc ban
hanh de » hanh ve, hanh kem
hieu ke » hieu kem, chieu ke, hieu ky
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ke cau » ket cau
ha hoi » hoa hoi, xa hoi, va hoi
te sac » te sach, te cac, te san

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 lang ((ha hoi) OR (ha noi)). hieu ke cau truc van ((hanh de) or (hanh vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ((ha hoi) OR (ha noi)). hieu ke cau truc van ((hanh de) OR (hanh vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang ((ha hoi) OR (ha noi)). hieu ke cau truc van ((hanh de) or (hanh vi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ((ha hoi) OR (ha noi)). hieu ke cau truc van ((hanh de) or (hanh vi)) cua triet*.