Perhaps you should try some spelling variations:
thuyet hach » thuyet xac, thuyet cac, thuyet anh
thuyet mach » thuyet xac, thuyet cac, thuyet anh
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » dung cong, thong cong, hang cong
tranh cua » doanh cua, manh cua
cua nhung » va nhung
van tuan » van quan, anh tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thuyet hach) OR (thuyet mach)) - hanh tranh cua nhung cong ((van tuan) or (van ban)) cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuyet hach) OR (thuyet mach)) - hanh tranh cua nhung cong ((van tuan) OR (van ban)) cu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thuyet hach) OR (thuyet mach)) - hanh tranh cua nhung cong ((van tuan) or (van ban)) cu".
• Adding a wildcard symbol may retrieve word variants: hoc ((thuyet hach) OR (thuyet mach)) - hanh tranh cua nhung cong ((van tuan) or (van ban)) cu*.