Perhaps you should try some spelling variations:
manh hanh » xanh hanh, danh thanh, minh thanh
van cham » van chat, van tham, van pham
hanh lai » hanh lam, hanh tai, thanh lap
sach thu » sach thue, sach thieu, sach tham
duc manh » suc manh, duc anh, duc minh
va cham » va chat, va tham
sach ty » sach y, sach tu, xach tay
ca viet » va viet, co viet, hoa viet
lai ca » lai cua, lai cam, loai ca
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: su ((sach ty) OR (sach thu)) nang x hoi. hieu ((van cham) or (va cham)) duc manh hanh lai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) nang x hoi. hieu ((van cham) OR (va cham)) duc manh hanh lai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach thu)) nang x hoi. hieu ((van cham) or (va cham)) duc manh hanh lai ca viet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach thu)) nang x hoi. hieu ((van cham) or (va cham)) duc manh hanh lai ca viet*.