Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
thue nang » thien nang, thuat nang, thi nang
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac dac » cac dan, cac dai, cac bac
va hanh » va thanh, va danh, ban hanh

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 thue nang xa hoi. hieu va cac dac ((va hanh) OR (van hanh)) dai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thue nang xa hoi. hieu va cac dac ((va hanh) OR (van hanh)) dai cua triet".
• Adding a wildcard symbol may retrieve word variants: toc sach thue nang xa hoi. hieu va cac dac ((va hanh) OR (van hanh)) dai cua triet*.