Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, hieu manh
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh huong » thanh huong, anh huong, manh huong
thong cong » trong cong, tong cong, thong thong
huong cua » dung cua
cua thong » cua thuong, cua khong, cua tong
cong san » cong tac
than cao » toan cao, than cap, than sao
thai cao » tai cao, thoai cac, thuat cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) or (chieu tinh)) - hanh huong cua thong cong san ((than cao) OR (thai cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu tinh)) - hanh huong cua thong cong san ((than cao) OR (thai cao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chieu tinh)) - hanh huong cua thong cong san ((than cao) OR (thai cao))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu tinh)) - hanh huong cua thong cong san ((than cao) OR (thai cao))*.