Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
cua triet » cua viet, su triet, va triet
hang cau » hang dau, hang ca, nhung cau
nam thuc » nam thuoc, am thuc, nam thu
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
ly hang » ly quang
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di 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 ly hang cau hoi. ((hieu quan) or (hieu qua)) nam thuc va hanh vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly hang cau hoi. ((hieu quan) OR (hieu qua)) nam thuc va hanh vi cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach ly hang cau hoi. ((hieu quan) or (hieu qua)) nam thuc va hanh vi cua triet*.