Perhaps you should try some spelling variations:
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach 2 » sach y
2 nang » v nang
ve cac » va cac, vien cac
xuc va » tuc va, luc va, xac va
de cua » te cua, dieu cua
le cua » ly cua

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 xa hoi. hieu ve cac ((xuc va) OR (duc va)) dinh ((de cua) or (le cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach 2 nang xa hoi. hieu ve cac ((xuc va) OR (duc va)) dinh ((de cua) OR (le cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach 2 nang xa hoi. hieu ve cac ((xuc va) OR (duc va)) dinh ((de cua) or (le cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach 2 nang xa hoi. hieu ve cac ((xuc va) OR (duc va)) dinh ((de cua) or (le cua)) te*.