Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
hanh doi » thanh doi, hanh noi, hang doi
van hanh » van thanh, ban hanh, van anh
cham sac » cham soc, pham sach, cap sac
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
sac van » cac van, san van, sat van
ty lang » tay lang, ty hang, tu lang
su sach » so sach, vu sach

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: su sach ((ty lang) OR (ty xang)) xa hoi. hieu vu cham sac van hanh doi ((cua triet) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty lang) or (ty xang)) xa hoi. hieu vu cham sac van hanh doi ((cua triet) OR (va triet))~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty lang) or (ty xang)) xa hoi. hieu vu cham sac van hanh doi ((cua triet) OR (va triet))*.