Perhaps you should try some spelling variations:
sach thi » sach tai, sach thieu, sach tham
sach thu » sach thue, sach thieu, sach tham
cac truc » cau truc, cac tru, cac trung
nang co » nang cao, nang doc, nang noi
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
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 thi) OR (sach thu)) nang co hoi. hieu va cac truc va hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thi) OR (sach thu)) nang co hoi. hieu va cac truc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) OR (sach thu)) nang co hoi. hieu va cac truc va hanh vi cua tre*.