Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
van nham » van nhan, van tham, van pham
nang ho » nang hoc, nang co, tang ho
hanh di » hanh vi, hanh de, hang di
ho hoi » hoc hoi, hoa hoi, hoi hoi
xac ky » cac ky, sac ky
bac ky » cac ky, ban ky, sac ky
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 ((xac ky) OR (bac ky)) nang ho hoi. hieu ((van nham) or (van nam)) thuc van hanh di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((xac ky) OR (bac ky)) nang ho hoi. hieu ((van nham) OR (van nam)) thuc van hanh di cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((xac ky) OR (bac ky)) nang ho hoi. hieu ((van nham) or (van nam)) thuc van hanh di cua triet*".