Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
nang som » nang song, nang soan, nang doc
hai duc » hoai duc, mai duc, ha duc
su sach » so sach, vu sach
nang so » nang co, nang ho, nang su
sach v » sach va, sach y, sach 2
va hai » van hai, va chai, va khai

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 v ((nang so) OR (nang som)) hai. lieu va hai duc va thanh vi ((cua triet) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang so) OR (nang som)) hai. lieu va hai duc va thanh vi ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang so) OR (nang som)) hai. lieu va hai duc va thanh vi ((cua triet) or (va triet))".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang so) OR (nang som)) hai. lieu va hai duc va thanh vi ((cua triet) or (va triet))*.