Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
hieu lang » chieu sang, nhieu tang, hieu van
trinh vat » trinh van, trinh luat, sinh vat
bang cong » dang cong, bang song, hang cong
vat bang » mat bang, va bang, van bang
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
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: doc ((hieu lang) OR (hieu quang)) - hanh trinh vat bang cong tan toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu lang) OR (hieu quang)) - hanh trinh vat bang cong tan toan ban".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu lang) OR (hieu quang)) - hanh trinh vat bang cong tan toan ban*.