Perhaps you should try some spelling variations:
dan khanh » dang khanh, van khanh, dat khanh
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
dan hanh » dang hanh, dan thanh, ban hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
ve am » va am
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 nang x hoi. hieu ve am thuc ((dan hanh) OR (dan khanh)) vai ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve am thuc ((dan hanh) OR (dan khanh)) vai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ve am thuc ((dan hanh) OR (dan khanh)) vai ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve am thuc ((dan hanh) OR (dan khanh)) vai ((cua triet) or (va triet))*.