Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
hieu quang » thieu quang, hieu qua, diep quang
nhung cong » dung cong, thong cong, hang cong
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
san tan » san van, san tay, san ten
van tan » van tuan, van ban, van tai

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) OR (hieu quan)) - hanh trung cua nhung cong ((san tan) or (van tan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quang) OR (hieu quan)) - hanh trung cua nhung cong ((san tan) OR (van tan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu quang) OR (hieu quan)) - hanh trung cua nhung cong ((san tan) or (van tan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu quang) OR (hieu quan)) - hanh trung cua nhung cong ((san tan) or (van tan)) cau*.