Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dao, sach dung
sach vuc » sach nuoc, sach truc, sach bac
vat hanh » vat thanh, van hanh, va hanh
hanh di » hanh vi, hanh de, hang di
ve chat » va chat, van chat
cuu tre » cua tre, cau tren, cau treo
ve cham » va cham, vu cham, ve chim
nang o » nang co, nang ho, nang ro
di cuu » di cau, di cua, dinh cuu
o hai » co hai, so hai, o lai

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 vuc) or (sach duoc)) nang o hai. hieu ((ve cham) OR (ve chat)) thuc vat hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vuc) OR (sach duoc)) nang o hai. hieu ((ve cham) OR (ve chat)) thuc vat hanh di cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach vuc) or (sach duoc)) nang o hai. hieu ((ve cham) OR (ve chat)) thuc vat hanh di cuu tre*".