Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te 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
vu hanh » vu khanh, vu thanh, du hanh
hanh va » hang va, hanh vi
va cau » van cau, va dau, va cao
va cua » va chua, via cua, ca cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang xa hoi. hieu ((va cau) OR (va cac)) phuc vu hanh va cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. hieu ((va cau) OR (va cac)) phuc vu hanh va cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. hieu ((va cau) OR (va cac)) phuc vu hanh va cua tu*.