Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh, bien tinh
manh tung » manh hung, thanh tung
cap trong » cay trong, ca trong, ap trong
cad trong » cay trong, ca trong, chat trong
doi lieu » duoc lieu, doi chieu, du lieu
cong dan » cong san, cong tan, huong dan
dan van » dang van, doan van, dao van

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi lieu tinh - manh tung ((cap trong) or (cad trong)) cong dan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi lieu tinh - manh tung ((cap trong) OR (cad trong)) cong dan van ban.
• Adding a wildcard symbol may retrieve word variants: doi lieu tinh - manh tung ((cap trong) or (cad trong)) cong dan van ban*.