Perhaps you should try some spelling variations:
chat xuc » chat huu, cam xuc, chao xu
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
lai hoi » dai hoi, lai hoa, lai roi
mai hoi » mai khoi, dai hoi, mai doi
ve chat » va chat, van chat
xuc va » duc va, tuc va, luc va
lai va » loai va, mai va, dai va
hai va » hai van, thai va, hoi va

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 ky nang ((mai hoi) OR (lai hoi)). hieu ve chat xuc va hanh ((lai va) or (hai va)) thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai hoi) OR (lai hoi)). hieu ve chat xuc va hanh ((lai va) OR (hai va)) thieu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((mai hoi) OR (lai hoi)). hieu ve chat xuc va hanh ((lai va) or (hai va)) thieu".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai hoi) OR (lai hoi)). hieu ve chat xuc va hanh ((lai va) or (hai va)) thieu*.