Perhaps you should try some spelling variations:
chinh truong » chinh trong, sinh truong, trinh truong
hinh trong » chinh trong, dinh trong, sinh trong
thanh toan » thanh hoa, thanh san, tinh toan
hieu lang » chieu sang, hieu quang, nhieu tang
cong cong » cong dong, trong cong, dung cong
manh toan » anh tuan, tinh toan
hoc hieu » hoc thieu, hoc hien, doc hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - ((chinh truong) or (hinh trong)) cua cong cong ((manh toan) OR (thanh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - ((chinh truong) OR (hinh trong)) cua cong cong ((manh toan) OR (thanh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - ((chinh truong) or (hinh trong)) cua cong cong ((manh toan) OR (thanh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - ((chinh truong) or (hinh trong)) cua cong cong ((manh toan) OR (thanh toan)) cao*.