Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
nang ma » tang ma, sang ma, nang cao
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
hanh di » hanh de, hang di, danh di

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach thu nang ma hoa. hieu ((van cac) or (van hac)) dat va ((hanh di) OR (hanh vi)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach thu nang ma hoa. hieu ((van cac) OR (van hac)) dat va ((hanh di) OR (hanh vi)) cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach thu nang ma hoa. hieu ((van cac) or (van hac)) dat va ((hanh di) OR (hanh vi)) cua vat".
• Adding a wildcard symbol may retrieve word variants: thu sach thu nang ma hoa. hieu ((van cac) or (van hac)) dat va ((hanh di) OR (hanh vi)) cua vat*.