Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh lam » thanh lap, hanh kem, hanh va
su triet » su viet, su tien, ve triet
sach ky » sach y, sach ty, sach kem
van hac » van hoc, van ha, van hai
xuc van » duc van, luc van, vuc van
sac ky » cac ky, sai ky
lam su » lai su, lam so, lam vu
x hoi » xa hoi, o hoi, x ho

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 ky) OR (sac ky)) nang x hoi. hieu ((van hac) or (van ban)) xuc van hanh lam su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang x hoi. hieu ((van hac) OR (van ban)) xuc van hanh lam su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang x hoi. hieu ((van hac) or (van ban)) xuc van hanh lam su triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) nang x hoi. hieu ((van hac) or (van ban)) xuc van hanh lam su triet*.