Perhaps you should try some spelling variations:
trinh toan » tinh toan, thanh toan, trinh quan
thong cong » trong cong, tong cong, thong thong
cong thanh » dong thanh, cong trinh, cong tan
thanh phan » thanh pho, thanh san, thanh toan
trinh han » trinh quan
theo chu » theo chieu, cho chu, theo yeu
chao chu » cho chu, cua chu, cao cho
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((theo chu) OR (chao chu)) xanh - hanh ((trinh toan) or (trinh han)) thong cong thanh phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo chu) OR (chao chu)) xanh - hanh ((trinh toan) OR (trinh han)) thong cong thanh phan dau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chu) OR (chao chu)) xanh - hanh ((trinh toan) or (trinh han)) thong cong thanh phan dau".
• Adding a wildcard symbol may retrieve word variants: ((theo chu) OR (chao chu)) xanh - hanh ((trinh toan) or (trinh han)) thong cong thanh phan dau*.