Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
cam thuc » am thuc, nam thuc, cam thu
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
lang xa » lang ha, dang xay, lang van
van cam » van nam, van lam, van cau
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua

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 y) or (cac ky)) lang xa hoi. hieu van cam thuc day hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (cac ky)) lang xa hoi. hieu van cam thuc day hanh di cua triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (cac ky)) lang xa hoi. hieu van cam thuc day hanh di cua triet*.