Perhaps you should try some spelling variations:
su sach » so sach, vu sach
hanh di » hanh de, hang di, danh di
cuu tre » cua tre, cau tren, cau treo
ve cam » ve cham, ve cac, ve cai
sach v » sach va, sach y, sach 2
va cam » va cham, va cac, va cao
v nang » va nang, vu nang, van nang
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 v nang x hoi. hieu ((ve cam) OR (va cam)) thuc vat ((hanh di) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang x hoi. hieu ((ve cam) OR (va cam)) thuc vat ((hanh di) OR (hanh vi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang x hoi. hieu ((ve cam) OR (va cam)) thuc vat ((hanh di) or (hanh vi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach v nang x hoi. hieu ((ve cam) OR (va cam)) thuc vat ((hanh di) or (hanh vi)) cuu tre*.