Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
thiet anh » thien anh, thuyet anh, thien danh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
tan toan » tan tran, van toan, dan toan
tap toan » tap quan, bai toan
tap doan » tap quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet anh - hanh tranh cua nhung cong ((tan toan) or (((tap toan) or (tap doan)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet anh - hanh tranh cua nhung cong ((tan toan) OR (((tap toan) OR (tap doan)))) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet anh - hanh tranh cua nhung cong ((tan toan) or (((tap toan) or (tap doan)))) cau*.