Perhaps you should try some spelling variations:
su sach » so sach, vu sach
dum cua » duy cua, dam cua, dung cua
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
tuc va » thuc va, truc va, tuc xa
du cua » duy cua, dau cua, hu cua
sach v » sach va, sach y, sach 2
xuc va » duc va, luc va, xac va
ve cac » va cac, vien cac
v nang » va nang, vu nang, van nang

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