Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
luc van » luoc van, luu van, luc va
hanh de » hanh ve, hanh kem
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
lang ha » long ha
ky lang » ky nang, ky dang, ky tang
ve cau » ke cau, va cau, ve cac
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang ha hoi. hieu ve cau ((luc van) OR (duc 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. hieu ve cau ((luc van) OR (duc van)) ((hanh de) or (hanh vi)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: te sac ky lang ha hoi. hieu ve cau ((luc van) OR (duc van)) ((hanh de) or (hanh vi)) cua triet*.