Perhaps you should try some spelling variations:
hieu quang » thieu quang, hieu quan, hieu qua
hanh trung » thanh trung, hanh trang, manh trung
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tac » cong ty
tan cau » toan cau, van cau, tan ca

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 quang - hanh trung cua nhung ((cong san) OR (cong tac)) tan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu quang - hanh trung cua nhung ((cong san) OR (cong tac)) tan cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu quang - hanh trung cua nhung ((cong san) OR (cong tac)) tan cau*.