Perhaps you should try some spelling variations:
lang dai » lang hai, lang mai, lang chai
cham duc » pham duc, cham soc, phan duc
pham duy » pham duc
va triet » va trien, ve triet, cua triet
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
va lang » va nang, hoa lang
thiet » thieu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ve ((cham duc) OR (pham duy)) va lang dai ((va triet) OR (va thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ve ((cham duc) or (pham duy)) va lang dai ((va triet) OR (va thiet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ve ((cham duc) or (pham duy)) va lang dai ((va triet) OR (va thiet))*.