Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu ve » hieu va, hieu van
cac xuc » cam xuc, cac nuoc, chat xuc
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
va dau » va dao
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: ((te sach) OR (toc sach)) y nang x hoi. hieu ve cac xuc va dau ((vi lua) or (vi luu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) y nang x hoi. hieu ve cac xuc va dau ((vi lua) OR (vi luu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) y nang x hoi. hieu ve cac xuc va dau ((vi lua) or (vi luu)) tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) y nang x hoi. hieu ve cac xuc va dau ((vi lua) or (vi luu)) tre*.