Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
hanh tri » thanh tri, hanh tai, hanh trinh
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
duc van » duc va, duc manh, duc phan
va cao » va cac, va co, va dao

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

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