Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hanh sai » hanh san, hanh tai, danh sai
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
cua cu » cua chu, cua cau, cua co
cua su » qua su

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

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