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