Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hanh trang » thanh trung, canh tranh, minh trang
hieu lang » chieu sang, hieu quang, nhieu tang
cua thong » cua thuong, cua khong, cua tong
thong huy » thong thuy, thong huyen, thong phuc
hoc hieu » hoc thieu, hoc hien, doc hieu
huy toan » huy tran, huu toan, huy hoang
toan ban » van ban

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 - ((hanh trang) or (hanh trinh)) cua thong thong huy toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - ((hanh trang) OR (hanh trinh)) cua thong thong huy toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - ((hanh trang) or (hanh trinh)) cua thong thong huy toan ban*.