Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hai cua » thai cua, dai cua, hoi cua
vai cua » dai cua, lai cua, bai cua
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
ve cac » va cac, vien cac

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