Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu cach » chieu sach, hieu ca, biet cach
tranh cua » doanh cua, manh cua
dung cong » dung trong
hang cong » dang cong, hang nong, bang cong
hieu cac » hieu luc, hieu va, hieu van
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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 cach) OR (hieu cac)) - hanh tranh cua ((dung cong) or (hang cong)) dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu cach) OR (hieu cac)) - hanh tranh cua ((dung cong) OR (hang cong)) dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu cach) OR (hieu cac)) - hanh tranh cua ((dung cong) or (hang cong)) dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu cach) OR (hieu cac)) - hanh tranh cua ((dung cong) or (hang cong)) dan toan cau*.