Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
lang ha » long ha
thu van » thuc van, thuy van, tu van
y lang » o lang, _ lang, tay lang
ha hoi » hoa hoi, ha noi, xa hoi
ve nam » he nam, va nam, te nam
le nam » ly nam, he nam, le na
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 y 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 y 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 y lang ha hoi. hieu ((ve nam) or (le nam)) thu van hanh vai su triet*.