Perhaps you should try some spelling variations:
dan manh » dang manh, doan manh, van manh
nam thuc » nam thuoc, am thuc, nam thu
sach ky » sac ky, sach y, sach kem
ca viet » va viet, co viet, hoa viet
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
vai ca » vai cac, vai cua, bai ca
ve nam » he nam, va nam, le nam
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: tu ((sach ky) OR (sach ty)) nang x hoi. hieu ve nam thuc ((dan manh) or (hoang minh)) vai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang x hoi. hieu ve nam thuc ((dan manh) OR (hoang minh)) vai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang x hoi. hieu ve nam thuc ((dan manh) or (hoang minh)) vai ca viet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) nang x hoi. hieu ve nam thuc ((dan manh) or (hoang minh)) vai ca viet*.