Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
nhung cong » dung cong, thong cong, hang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
hieu cac » hieu luc, hieu va, hieu van
trang va » tran van, hang va
cong san » cong tac
phan cau » phan dau, phan cac, phan lap

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 cac - hanh trang va nhung cong san ((phan cau) OR (phan tu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu cac - hanh trang va nhung cong san ((phan cau) OR (phan tu))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu cac - hanh trang va nhung cong san ((phan cau) OR (phan tu))*.