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
hieu van » hieu va, thien van, lieu va
van than » van thanh, van thang, van tuan
hanh hai » thanh hai, nhanh hai, hang hai
su sach » so sach, vu sach
duc ban » duc tan, dua ban, duc man
duc van » duc va, duc tan, duc manh
hai cua » thai cua, dai cua, hoi cua

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 thue nang ((x ho) or (xa hoi)). hieu van than ((duc ban) or (duc van)) hanh hai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thue nang ((x ho) OR (xa hoi)). hieu van than ((duc ban) OR (duc van)) hanh hai cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach thue nang ((x ho) or (xa hoi)). hieu van than ((duc ban) or (duc van)) hanh hai cua triet*.