Perhaps you should try some spelling variations:
cau treo » cau theo, cau tren, cau triet
van hang » van khang, van hoang, van thang
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
hang di » hang doi, hang vi, hang dien
te sach » toc sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
cac duc » cac du, cao duc, cac dac
y nang » ky nang, ly nang, v nang

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 xa hoi. ((hieu ve) OR (hieu va)) cac duc van hang di ((cua tre) or (cau treo))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. ((hieu ve) OR (hieu va)) cac duc van hang di ((cua tre) OR (cau treo))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. ((hieu ve) OR (hieu va)) cac duc van hang di ((cua tre) or (cau treo))*".