Perhaps you should try some spelling variations:
hanh trang » thanh trung, canh tranh, hanh trinh
thieu quan » thieu quang, thien quan, hieu qua
quang toan » quang tuan, quang tran, quang doan
hieu quan » hieu qua, lieu quan, thien quan
trang cua » tranh cua, tang cua, trung cua
cong cong » cong dong, trong cong, dang cong
dung cong » dung trong
toan cao » toan ban, toan tap

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

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