Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh, bien tinh
hang cong » dang cong, hang nong, bang cong
van thanh » ban thanh, van tuan
doi lieu » duoc lieu, doi chieu, du lieu
tang cua » hang cua, tang luan, thong cua
mang cua » manh cua, dung cua, ban cua
van tai » von tai, van tuan

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: doi lieu tinh - hanh ((tang cua) OR (mang cua)) hang cong ((van tai) OR (van thanh)) cau~.
• Adding a wildcard symbol may retrieve word variants: doi lieu tinh - hanh ((tang cua) or (mang cua)) hang cong ((van tai) or (van thanh)) cau*.