Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau luu » cau luc
hanh va » hang va, hanh vi
hanh de » hanh ve, hanh kem
luu van » cuu van, luan van, luu hanh
hieu ve » hieu va, hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, xa 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. ((hieu ve) or (hieu qua)) cau luu van ((hanh de) or (hanh va)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ha hoi. ((hieu ve) OR (hieu qua)) cau luu van ((hanh de) OR (hanh va)) cua triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ha hoi. ((hieu ve) or (hieu qua)) cau luu van ((hanh de) or (hanh va)) cua triet*.