Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van khang » van khanh, van thanh, van hanh
van quang » van quan, tran quang, van tuan
hien cac » thien cac, vien cac, hieu cac
cac truc » cau truc, cac tru, cac trung
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
sach 2 » sach y
2 nang » v nang
x hoi » xa hoi, o hoi, x ho
di su » doi su, ki su, da su

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 2 nang x hoi. hieu hien cac truc ((van khang) or (van quang)) di su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 2 nang x hoi. hieu hien cac truc ((van khang) OR (van quang)) di su triet.
• Adding a wildcard symbol may retrieve word variants: su sach 2 nang x hoi. hieu hien cac truc ((van khang) or (van quang)) di su triet*.