Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
su triet » su tien, ve triet
hien cac » thien cac, vien cac, hieu cac
hang vai » hang tai, hang hai, hang vi
tu sach » thu sach, su sach, te sach
duc ban » duc tan, duc van, dua ban
cac duc » cac du, cao duc, cac dac
su viet » so viet
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
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 v nang x hoi. hieu hien cac duc ban ((hang vai) or (hang va)) ((su triet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v nang x hoi. hieu hien cac duc ban ((hang vai) OR (hang va)) ((su triet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v nang x hoi. hieu hien cac duc ban ((hang vai) or (hang va)) ((su triet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach v nang x hoi. hieu hien cac duc ban ((hang vai) or (hang va)) ((su triet) OR (su viet))*.