Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau tren » cu tren, dau tren, ca tren
sach dao » lanh dao
dao nang » cao nang, da nang, dai nang
va hanh » van hanh, va thanh, va danh
dau luc » cau luc, dau luan, dau nuoc
su sach » so sach, vu sach
thi van » thi lan, thi hanh, thi nang
van dau » van dao, phan dau
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, ma hoa, me hoi

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 dao nang ((ma hoi) OR (xa hoi)). thi van dau luc va hanh vi ((cua triet) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach dao nang ((ma hoi) OR (xa hoi)). thi van dau luc va hanh vi ((cua triet) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach dao nang ((ma hoi) OR (xa hoi)). thi van dau luc va hanh vi ((cua triet) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: su sach dao nang ((ma hoi) OR (xa hoi)). thi van dau luc va hanh vi ((cua triet) or (cau tren))*.