Perhaps you should try some spelling variations:
su sach » vu sach
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
luu tre » luu tru, cuu tre, luy tre
so sach » so sanh, bo sach, co sach
may hoi » may thoi, tay hoi, mai hoi
va cam » va cham, va cac, va cao
vi luu » vi lua
ve cam » ve cham, ve cac, ve cai
mang » nang, dang, bang

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) OR (so sach)) 2 mang may hoi. hieu ((ve cam) or (va cam)) thuc va hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) 2 mang may hoi. hieu ((ve cam) OR (va cam)) thuc va hanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) 2 mang may hoi. hieu ((ve cam) or (va cam)) thuc va hanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) 2 mang may hoi. hieu ((ve cam) or (va cam)) thuc va hanh vi luu tre*.