Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
vai cua » dai cua, hai cua, lai cua
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua
luc va » duc va, tuc va, loc va

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 ((luc va) or (tuc xa)) hanh ((vai cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ve cac ((luc va) OR (tuc xa)) hanh ((vai cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu ve cac ((luc va) or (tuc xa)) hanh ((vai cua) or (di cua)) tre*.