Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
tu sach » thu sach, su sach, te sach
luc van » luoc van, duc van, luc va
dao cua » dai cua, day cua, dan cua
anh dao » lanh dao, hanh dao, anh dat
hieu va » lieu va, hieu qua
luu van » cuu van, luan van, luu hanh
va cau » van cau, va cac, va dau
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
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 khoi)). hieu va cau ((luc van) or (luu van)) anh dao cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((ma hoi) OR (mai khoi)). hieu va cau ((luc van) OR (luu van)) anh dao cua tu.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((ma hoi) or (mai khoi)). hieu va cau ((luc van) or (luu van)) anh dao cua tu*.