Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham sac » cham soc, pham sach, cham mat
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu vu » hieu va, hieu ve, hieu su
cua tre » cua te, cuu tre, dua tren

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