Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
xuc van » duc van, luc van, thuc van
xuc ban » duc ban, cuc ban, quoc ban
vai cua » dai cua, hai cua, lai cua
vi cua » di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ty nang xa hoi. hieu ve chat ((xuc van) OR (xuc ban)) hanh ((vi cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. hieu ve chat ((xuc van) OR (xuc ban)) hanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang xa hoi. hieu ve chat ((xuc van) OR (xuc ban)) hanh ((vi cua) or (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. hieu ve chat ((xuc van) OR (xuc ban)) hanh ((vi cua) or (vai cua)) tre*.