Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
bach thi » bach thu, cach thoi, quach thi
thi hang » thi hanh, thi nang, thi hong
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan, thuc vat
hang xa » hoang xa, hang va, hang ca
hieu ve » hieu va
thuc va » thuc vat, thuc day
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach thi hang xa hoi. ((hieu ve) OR (hieu van)) nam ((thuc va) OR (thuc dan)) thanh dai cua tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu bach thi hang xa hoi. ((hieu ve) OR (hieu van)) nam ((thuc va) or (thuc dan)) thanh dai cua tu~".
• Adding a wildcard symbol may retrieve word variants: vu bach thi hang xa hoi. ((hieu ve) OR (hieu van)) nam ((thuc va) or (thuc dan)) thanh dai cua tu*.