Perhaps you should try some spelling variations:
sach vuc » sach duoc, sach nuoc, sach truc
vat hanh » vat thanh, van hanh, va hanh
sach dao » lanh dao
hanh di » hanh vi, hanh de, hang di
vu cham » va cham, vu kham, tu cham
ve cham » va cham, ve chat, ve chim
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu
x hoi » xa hoi, o hoi, x ho

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 dao)) nang x hoi. hieu ((ve cham) OR (vu cham)) thuc vat hanh di cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vuc) OR (sach dao)) nang x hoi. hieu ((ve cham) OR (vu cham)) thuc vat hanh di cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach vuc) or (sach dao)) nang x hoi. hieu ((ve cham) OR (vu cham)) thuc vat hanh di cuu tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach vuc) or (sach dao)) nang x hoi. hieu ((ve cham) OR (vu cham)) thuc vat hanh di cuu tre*.