Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
trinh vat » trinh luat, sinh vat, trinh han
trinh van » trinh han, trinh quan, trinh toan
trinh va » trinh ve, trinh vi, trinh han
cong san » cong tac
san toan » van toan, dan toan, 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 vat) OR (trinh van)))) nhung cong san toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: o ha tinh - hanh ((trinh va) OR (((trinh vat) OR (trinh van)))) nhung cong san toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "o ha tinh - hanh ((trinh va) or (((trinh vat) OR (trinh van)))) nhung cong san toan cao".
• Adding a wildcard symbol may retrieve word variants: o ha tinh - hanh ((trinh va) or (((trinh vat) OR (trinh van)))) nhung cong san toan cao*.