Perhaps you should try some spelling variations:
dinh dieu » dinh dien, dinh tieu, vinh dieu
dieu cua » dieu tra
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cac » van hac, van cau, dan cac
van bac » van ban, van bao, van hac
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
cua te » cua tu

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 y nang xa hoi. hieu ((van cac) or (van bac)) ((xuc va) OR (luc va)) dinh dieu cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang xa hoi. hieu ((van cac) OR (van bac)) ((xuc va) OR (luc va)) dinh dieu cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang xa hoi. hieu ((van cac) or (van bac)) ((xuc va) OR (luc va)) dinh dieu cua te".
• Adding a wildcard symbol may retrieve word variants: su sach y nang xa hoi. hieu ((van cac) or (van bac)) ((xuc va) OR (luc va)) dinh dieu cua te*.