Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lang phi » lang phu, lang chai, lang ha
phi cua » phai cua, chi cua, khi cua
hieu ve » hieu va, hieu van
so sach » so sanh, co sach, hoc sach
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
bo sach » co sach, hoc sach
dac ba » dan ba, sac ba
cac ba » cac bai, cac ban, cac bac
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (bo sach)) ky dang xa hoi. hieu ve cac ((dac ba) OR (cac ba)) lang phi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (bo sach)) ky dang xa hoi. hieu ve cac ((dac ba) OR (cac ba)) lang phi cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (bo sach)) ky dang xa hoi. hieu ve cac ((dac ba) OR (cac ba)) lang phi cua triet".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) ky dang xa hoi. hieu ve cac ((dac ba) OR (cac ba)) lang phi cua triet*.