Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
ban hanh » ban hang
te sach » toc sach
cac duc » cac du, cao duc, cac dac
hieu ve » hieu van
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cau tre » cau tren, cau treo, cau tra
y nang » ky nang, ly nang, v nang
di cau » da cau, diem cau

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 ((ban hanh) or (va thanh)) di cau tre~.
• 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 ((ban hanh) OR (va thanh)) di cau tre.
• 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 ((ban hanh) or (va thanh)) di cau tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. ((hieu ve) OR (hieu va)) cac duc ((ban hanh) or (va thanh)) di cau tre*.