Perhaps you should try some spelling variations:
sach dao » lanh dao
cau duc » cao duc, cau luc, chu duc
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
sach lo » sach doi, sach hoi, sach moi
ve cau » ke cau, va cau, ve cac
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((sach lo) OR (sach dao)) nang x hoi. hieu ve cau duc va hanh ((vai cua) or (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((sach lo) OR (sach dao)) nang x hoi. hieu ve cau duc va hanh ((vai cua) OR (lai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach lo) OR (sach dao)) nang x hoi. hieu ve cau duc va hanh ((vai cua) or (lai cua)) tre*".