Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
ma khoi » ra khoi, xa khoi, cac khoi
van tri » van tai, van thi, van toi
cua tuc » cua duc, cua tu, cua thuoc
va cau » van cau, va cac, va dau
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky tang ((ma khoi) OR (mai khoi)). lieu va cau ((xuc va) or (duc va)) van tri cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky tang ((ma khoi) OR (mai khoi)). lieu va cau ((xuc va) OR (duc va)) van tri cua tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky tang ((ma khoi) OR (mai khoi)). lieu va cau ((xuc va) or (duc va)) van tri cua tuc".
• Adding a wildcard symbol may retrieve word variants: bo sach ky tang ((ma khoi) OR (mai khoi)). lieu va cau ((xuc va) or (duc va)) van tri cua tuc*.