Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh va » trinh van, trinh vat, trinh vi
trinh ve » trinh vi, trinh viet, trinh van
trinh he » trinh han, trinh hoa, trinh thi
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap
ha tinh » va tinh, may tinh
o ha » y ha, _ ha

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

• Performing a fuzzy search may retrieve terms with similar spellings: o ha tinh - hanh ((trinh va) or (((trinh ve) OR (trinh he)))) nhung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: o ha tinh - hanh ((trinh va) OR (((trinh ve) OR (trinh he)))) nhung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "o ha tinh - hanh ((trinh va) or (((trinh ve) OR (trinh he)))) nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: o ha tinh - hanh ((trinh va) or (((trinh ve) OR (trinh he)))) nhung cong dan toan cao*.