Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
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
han tai » hang tai, nhan tai, van tai
tai cua » thai cua, tai cuc, tri cua
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 tu nang xa hoi. hieu va cao ((duc van) or (duc tan)) han tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang xa hoi. hieu va cao ((duc van) OR (duc tan)) han tai cua triet.
• Adding a wildcard symbol may retrieve word variants: te sach tu nang xa hoi. hieu va cao ((duc van) or (duc tan)) han tai cua triet*.