Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan
manh vai » manh hai, manh va, manh khai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ca viet » va viet, co viet, hoa viet
ve nam » he nam, va nam, le nam
vai ca » vai cac, vai cua, bai ca
x hoi » xa hoi, o hoi, 5 hoi

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 ((x hoi) OR (x ho)). hieu ve nam ((thuc dan) or (thuc vat)) manh vai ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((x hoi) OR (x ho)). hieu ve nam ((thuc dan) OR (thuc vat)) manh vai ca viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((x hoi) OR (x ho)). hieu ve nam ((thuc dan) or (thuc vat)) manh vai ca viet*".