Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
thu van » thuc van, thuy van, tu van
sach ky » sach y, sach ty, sach kem
lang ha » long ha
ha hoi » hoa hoi, ha noi, xa hoi
ve nam » he nam, va nam, te nam
le nam » ly nam, he nam, le na
sac ky » cac ky, sai ky
vai su » va su, van su, lai su

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) OR (sac ky)) lang ha hoi. hieu ((ve nam) or (le nam)) thu van hanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) lang ha hoi. hieu ((ve nam) OR (le nam)) thu van hanh vai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) lang ha hoi. hieu ((ve nam) or (le nam)) thu van hanh vai su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) lang ha hoi. hieu ((ve nam) or (le nam)) thu van hanh vai su triet*.