Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
thien anh » thien danh, tien anh, thien thanh
huy duong » thuy duong, huy dong, hai duong
cong manh » cong danh, duong manh, cong thanh
manh toan » thanh toan, anh tuan, tinh toan
hien anh » hien hanh, dien anh, tien anh
ky duong » ke duong, ky thuong, may duong
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: hoc ((hien anh) OR (thien anh)) - canh trinh ((ky duong) or (huy duong)) cong manh toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien anh) OR (thien anh)) - canh trinh ((ky duong) OR (huy duong)) cong manh toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien anh) OR (thien anh)) - canh trinh ((ky duong) or (huy duong)) cong manh toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien anh) OR (thien anh)) - canh trinh ((ky duong) or (huy duong)) cong manh toan ban*.