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 te » hanh tu, hanh ve, hanh de
su sach » vu sach
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
te cua » tue cua, le cua, de cua
va cam » va cham, va cac, va cao
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) OR (so sach)) ty nang o hai. hieu ((va cam) or (ve cac)) thuc day hanh te cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang o hai. hieu ((va cam) OR (ve cac)) thuc day hanh te cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty nang o hai. hieu ((va cam) or (ve cac)) thuc day hanh te cua triet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ty nang o hai. hieu ((va cam) or (ve cac)) thuc day hanh te cua triet*.