Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
hanh tang » hanh trang, anh tang, hanh mang
tang luan » dung luan
luan bang » luan nang, luan ban, luan tang
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tap » cuong tap, cong tac, tong tap
cong tan » cong tac, cong san, cong thanh
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 lang - hanh tang luan bang ((cong tap) OR (cong tan)) toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh tang luan bang ((cong tap) OR (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh tang luan bang ((cong tap) OR (cong tan)) toan cau*.