Perhaps you should try some spelling variations:
te sach » toc sach
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
ve cac » va cac, vien cac
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: te sach ((y nang) or (v nang)) x hoi. hieu ve cac duc tan ((hanh di) or (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (v nang)) x hoi. hieu ve cac duc tan ((hanh di) OR (hanh de)) cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((y nang) or (v nang)) x hoi. hieu ve cac duc tan ((hanh di) or (hanh de)) cua tre*.