Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
hanh vai » hanh vi, hanh va, hanh tai
va triet » va trien, ve triet, va viet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
qua cac » cua cac
va hanh » van hanh, va thanh, va danh
cac ly » cac ky, cac le, cam ly
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. hieu qua cac ly va hanh vai ((cua triet) or (((va triet) OR (va thiet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu qua cac ly va hanh vai ((cua triet) OR (((va triet) OR (va thiet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. hieu qua cac ly va hanh vai ((cua triet) or (((va triet) OR (va thiet))))".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu qua cac ly va hanh vai ((cua triet) or (((va triet) OR (va thiet))))*.