Perhaps you should try some spelling variations:
hanh dao » lanh dao, thanh dat, thanh dam
tu sach » thu sach, su sach, te sach
dao cua » dai cua, day cua, dan cua
duc van » duc va, duc tan, duc manh
luc van » luoc van, luu van, luc va
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
va cau » van cau, va cac, va dau
y nang » ky nang, ly nang, v nang
ma hoi » xa hoi, ma hoa, me hoi
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 y nang ((ma hoi) or (mai hoi)). hieu va cau ((luc van) OR (duc van)) hanh dao cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((ma hoi) OR (mai hoi)). hieu va cau ((luc van) OR (duc van)) hanh dao cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ((ma hoi) or (mai hoi)). hieu va cau ((luc van) OR (duc van)) hanh dao cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((ma hoi) or (mai hoi)). hieu va cau ((luc van) OR (duc van)) hanh dao cua tu*.