Perhaps you should try some spelling variations:
sach dao » lanh dao
nang mai » nang ma, nang tai, lang mai
cac truc » cau truc, cac tru, cac trung
sach lo » sach doi, sach hoi, sach moi
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
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 lo) or (sach dao)) nang mai hoi. hieu ve cac truc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach lo) OR (sach dao)) nang mai hoi. hieu ve cac truc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach lo) or (sach dao)) nang mai hoi. hieu ve cac truc va hanh vi cua tre*.