Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
dinh vai » dinh van, dinh vi, dinh va
thu nang » thi nang, thu hang, thu bang
hien cac » thien cac, vien cac, hieu cac
dua tren » dung tren
sach thu » sach thue, sach thieu, sach tham
su sach » so sach, vu sach
va dinh » van dinh, va kinh, va tinh
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va
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: su sach thu nang x hoi. hieu hien cac lo va dinh vai ((dua tren) or (((cua triet) OR (su triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang x hoi. hieu hien cac lo va dinh vai ((dua tren) OR (((cua triet) OR (su triet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang x hoi. hieu hien cac lo va dinh vai ((dua tren) or (((cua triet) OR (su triet))))".
• Adding a wildcard symbol may retrieve word variants: su sach thu nang x hoi. hieu hien cac lo va dinh vai ((dua tren) or (((cua triet) OR (su triet))))*.