Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
su triet » su viet, su tien, ve triet
dinh vai » dinh van, dinh vi, dinh va
thu nang » thi nang, thu hang, thu bang
cua viet » ca viet, hoa viet, cua vat
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
nang xa » nang x, lang xa, nang ma
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va

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 xa hoi. hieu hien cac lo va dinh vai ((dua tren) or (((cua viet) or (su triet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang xa hoi. hieu hien cac lo va dinh vai ((dua tren) OR (((cua viet) OR (su triet)))).
• Adding a wildcard symbol may retrieve word variants: su sach thu nang xa hoi. hieu hien cac lo va dinh vai ((dua tren) or (((cua viet) or (su triet))))*.