Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
hanh le » thanh le, hanh ve, hanh de
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
ve cham » va cham, ve chat, vu cham
ve cac » va cac, vien cac
co hoi » co hoc, co loi
le cua » ly cua
o hai » co hai, so hai, o lai

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 xang ((co hoi) or (o hai)). hieu ((ve cham) or (ve cac)) thuc day hanh le cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty xang ((co hoi) OR (o hai)). hieu ((ve cham) OR (ve cac)) thuc day hanh le cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty xang ((co hoi) or (o hai)). hieu ((ve cham) or (ve cac)) thuc day hanh le cua triet*.