Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van quang » van quan, tran quang, van tuan
hang vai » hang tai, hang hai, hang vi
hien cac » thien cac, vien cac, hieu cac
su triet » su viet, su tien, ve triet
van nang » van ban, van dong, van dung
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
tu sach » thu sach, su sach, te sach
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: tu sach ((van nang) OR (van quang)) x hoi. hieu hien cac duc ban ((hang vai) or (hang va)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((van nang) OR (van quang)) x hoi. hieu hien cac duc ban ((hang vai) OR (hang va)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((van nang) OR (van quang)) x hoi. hieu hien cac duc ban ((hang vai) or (hang va)) su triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((van nang) OR (van quang)) x hoi. hieu hien cac duc ban ((hang vai) or (hang va)) su triet*.