Perhaps you should try some spelling variations:
thanh trung » thanh tung
khong cong » thong cong, chong cong, khong con
khong cang » thong cong, hong bang, khong dung
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, trung cap
vinh toan » tinh toan, hinh toan, minh toan
ho chieu » theo chieu, doi chieu, mot chieu
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (ho chieu)) xanh - thanh trung cua ((khong cong) OR (khong cang)) vinh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (ho chieu)) xanh - thanh trung cua ((khong cong) OR (khong cang)) vinh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (ho chieu)) xanh - thanh trung cua ((khong cong) OR (khong cang)) vinh toan ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (ho chieu)) xanh - thanh trung cua ((khong cong) OR (khong cang)) vinh toan ban*.