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

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

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