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