Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trang » thanh trung, canh tranh, minh trang
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, nhieu tang, hieu van
cua nhung » va nhung
cong tan » cong tac, cong san, cong thanh
tan chan » dan chan, ban chan, can chan
chan cho » chat cho, han cho, chuan chon

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoi ((hieu lang) or (hieu quang)) - ((hanh trang) OR (hanh trinh)) cua nhung cong tan chan cho~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoi ((hieu lang) OR (hieu quang)) - ((hanh trang) OR (hanh trinh)) cua nhung cong tan chan cho.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoi ((hieu lang) or (hieu quang)) - ((hanh trang) OR (hanh trinh)) cua nhung cong tan chan cho".
• Adding a wildcard symbol may retrieve word variants: hoi ((hieu lang) or (hieu quang)) - ((hanh trang) OR (hanh trinh)) cua nhung cong tan chan cho*.