Perhaps you should try some spelling variations:
hanh may » hanh ma, hanh mau, hanh ngay
va triet » va thiet, va trien, ve triet
lang ha » long ha
qua cao » qua cac, qua ca, qua cai
cao hoc » co hoc, cho hoc, chat hoc
va hanh » van hanh, va thanh, ban hanh
xac ky » cac ky, sac ky
bac ky » cac ky, ban ky, sac ky
ha hoi » hoa hoi, ha noi, xa hoi
may va » may vi, day va

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)) lang ha hoi. hieu qua cao hoc va hanh may va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((xac ky) OR (bac ky)) lang ha hoi. hieu qua cao hoc va hanh may va triet".
• Adding a wildcard symbol may retrieve word variants: su ((xac ky) OR (bac ky)) lang ha hoi. hieu qua cao hoc va hanh may va triet*.