Perhaps you should try some spelling variations:
sach dao » lanh dao
van hanh » van thanh, ban hanh, van anh
sach moi » sach doi, sach hoi, bach mai
va hanh » va thanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai cua
qua cac » cua cac
cac luc » cau luc, coc luc, cac nuoc
lang xa » lang ha, dang xay, lang van
cua te » cua tu

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 moi) or (sach dao)) lang xa hoi. hieu qua cac luc ((va hanh) OR (van hanh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach moi) OR (sach dao)) lang xa hoi. hieu qua cac luc ((va hanh) OR (van hanh)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach moi) or (sach dao)) lang xa hoi. hieu qua cac luc ((va hanh) OR (van hanh)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach moi) or (sach dao)) lang xa hoi. hieu qua cac luc ((va hanh) OR (van hanh)) vai cua te*.