Perhaps you should try some spelling variations:
canh trinh » canh tranh, canh tinh, anh trinh
thuat sach » thuat lanh
hanh trinh » canh tranh, hanh chinh
chuan dong » chua dong, chuan long, chuyen dong
cong thang » cong thanh, cang thang, cong thong
thuat san » thuat toan, thuat song, thuat lanh
dong cong » duong cong, dung cong, dang cong
thang ban » hang ban, tang ban, thanh ban
ban cau » bang cau, ban can, van cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thuat sach) or (thuat san)) - ((canh trinh) OR (hanh trinh)) chuan dong cong thang ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thuat sach) OR (thuat san)) - ((canh trinh) OR (hanh trinh)) chuan dong cong thang ban cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thuat sach) or (thuat san)) - ((canh trinh) OR (hanh trinh)) chuan dong cong thang ban cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thuat sach) or (thuat san)) - ((canh trinh) OR (hanh trinh)) chuan dong cong thang ban cau*.