Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dieu » han dieu, hinh dieu, hoang dieu
cham sac » cham soc, pham sach, cap sac
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, dua tren
sac van » cac van, san van, sat van
su sach » so sach, vu sach
hieu su » hieu sau, tieu su, hieu so
ty lang » tay lang, ty hang, tu lang
su cham » su pham, tu cham, vu cham

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty lang) or (ty xang)) xa hoi. hieu su cham sac van hanh dieu ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty lang) OR (ty xang)) xa hoi. hieu su cham sac van hanh dieu ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty lang) or (ty xang)) xa hoi. hieu su cham sac van hanh dieu ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty lang) or (ty xang)) xa hoi. hieu su cham sac van hanh dieu ((cua tre) OR (cua triet))*.