Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
hanh tri » thanh tri, hanh tai, hanh trinh
ty nang » ky nang, ty hang, ly nang
xuc van » duc van, vuc van, xuc ban
luc van » luoc van, luu van, duc van
co hoi » co hoc, co loi
va cau » van cau, va cac, va dau
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: hoc sach ((ty nang) OR (ty xang)) co hoi. lieu va cau ((xuc van) or (luc van)) hanh tri cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ty nang) OR (ty xang)) co hoi. lieu va cau ((xuc van) OR (luc van)) hanh tri cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((ty nang) OR (ty xang)) co hoi. lieu va cau ((xuc van) or (luc van)) hanh tri cua tu".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ty nang) OR (ty xang)) co hoi. lieu va cau ((xuc van) or (luc van)) hanh tri cua tu*.