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