Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
hang cau » hang dau, hang ca, nhung cau
nam thuc » nam thuoc, am thuc, nam thu
va triet » va thiet, va trien, ve triet
sach lo » sach dao, sach doi, sach hoi
sach ly » sach y, sach ty, sach hay
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
vi va » vi van, vai va, vu va

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) or (sach lo)) hang cau hoi. ((hieu quan) or (hieu qua)) nam thuc va hanh vi va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach lo)) hang cau hoi. ((hieu quan) OR (hieu qua)) nam thuc va hanh vi va triet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) or (sach lo)) hang cau hoi. ((hieu quan) or (hieu qua)) nam thuc va hanh vi va triet*.