Perhaps you should try some spelling variations:
sach tham » sach nha
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, cach thuc
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, dua tren
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach thu) OR (sach tham)) nang x hoi. hieu va pham duc va danh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach tham)) nang x hoi. hieu va pham duc va danh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach tham)) nang x hoi. hieu va pham duc va danh vi ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) OR (sach tham)) nang x hoi. hieu va pham duc va danh vi ((cua tre) or (cua triet))*.