Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
dan manh » dang manh, doan manh, van manh
manh vai » manh hai, manh va, manh khai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
ca viet » va viet, co viet, hoa viet
ve nam » he nam, le nam, viet nam
te nam » tu nam, he nam, tw nam
va nam » van nam, ha nam, va nay
vai ca » vai cac, vai cua, bai ca

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 nang xa hoi. hieu ((((ve nam) OR (te nam))) or (va nam)) thuc dan manh vai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((((ve nam) OR (te nam))) OR (va nam)) thuc dan manh vai ca viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((((ve nam) OR (te nam))) or (va nam)) thuc dan manh vai ca viet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((((ve nam) OR (te nam))) or (va nam)) thuc dan manh vai ca viet*.