Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu ve » hieu van
hanh va » hang va, hanh vi
hieu va » lieu va, hieu qua
hanh de » hanh ve, hanh kem
cau luu » cau luc
luu van » cuu van, luan van, luu hanh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, xa hoi

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 va)) 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 va)) cau luu van ((hanh de) OR (hanh va)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky lang ha hoi. ((hieu ve) OR (hieu va)) 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 va)) cau luu van ((hanh de) or (hanh va)) cua triet*.