Perhaps you should try some spelling variations:
sach den » sach de, sach dung, mach dien
den dang » de dang, den nang, den bang
tu sach » thu sach, su sach, te sach
dang xa » dang xay, lang xa, dang ha
phuc va » phuc vu, thuc va, chuc va
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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 den dang xa hoi. hieu ((van chat) or (cao chat)) phuc va hanh vi ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach den dang xa hoi. hieu ((van chat) OR (cao chat)) phuc va hanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach den dang xa hoi. hieu ((van chat) or (cao chat)) phuc va hanh vi ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach den dang xa hoi. hieu ((van chat) or (cao chat)) phuc va hanh vi ((cua tre) OR (cua te))*.