Perhaps you should try some spelling variations:
cong trong » cong thuong, duong trong, cong trinh
thieu xanh » chieu xanh, hieu manh, thien danh
thien anh » thien danh, tien anh, thien thanh
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
trong tan » trong quan, trong cac, trong ca
tinh cua » trinh cua, sinh cua, tinh chat
tan toan » tan tran, tap toan, van toan
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 xanh) or (thien anh)) - hanh tinh cua cong trong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu xanh) OR (thien anh)) - hanh tinh cua cong trong tan toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu xanh) or (thien anh)) - hanh tinh cua cong trong tan toan cao*.