Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu hang » thi hang, thuc hanh, thu huong
thuc van » thuc dan, thuc va, thuc hanh
tu sach » thu sach, su sach, te sach
hang co » hang cho, hang ca, nang co
hieu va » hieu qua
cua tre » cua te, cuu tre, cua triet
co loi » co hoi
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: tu sach thu hang co loi. ((hieu va) OR (lieu va)) cau ((thuc van) or (thuc vat)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu hang co loi. ((hieu va) OR (lieu va)) cau ((thuc van) OR (thuc vat)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu hang co loi. ((hieu va) OR (lieu va)) cau ((thuc van) or (thuc vat)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thu hang co loi. ((hieu va) OR (lieu va)) cau ((thuc van) or (thuc vat)) hanh vi cua tre*.