Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau luan » cu luan, dau luan, lau luan
hanh de » hanh ve, hanh kem
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hanh va » hang va, hanh vi
hieu ke » hieu kem, chieu ke, hieu ky
te sac » te sach, te cac, te san
ha hoi » hoa hoi, ha noi, xa hoi
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) OR (tu cac)) ky lang ha hoi. hieu ke cau luan van ((hanh de) OR (hanh va)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (tu cac)) ky lang ha hoi. hieu ke cau luan van ((hanh de) OR (hanh va)) cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (tu cac)) ky lang ha hoi. hieu ke cau luan van ((hanh de) OR (hanh va)) cua triet*.