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
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
y nang » ky nang, ly nang, may nang
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: te sach ((y nang) OR (v nang)) x hoi. hieu ve cac duc van ((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 van ((hanh di) OR (hanh de)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) OR (v nang)) x hoi. hieu ve cac duc van ((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 van ((hanh di) or (hanh de)) cua tre*.