Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
chieu sach » chinh sach, chiet tach, chieu sang
hieu cach » hieu cac, hieu ca, biet cach
duong van » duong va, luong va, dang van
tranh va » tranh van, trang va, trinh va
cong van » cong vang, cong san, song van
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: toc ((hieu cach) or (chieu sach)) - hanh tranh va nhung ((cong van) or (duong van)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu cach) OR (chieu sach)) - hanh tranh va nhung ((cong van) OR (duong van)) toan cau.
• Adding a wildcard symbol may retrieve word variants: toc ((hieu cach) or (chieu sach)) - hanh tranh va nhung ((cong van) or (duong van)) toan cau*.