Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sang » chieu sach, chieu xanh, hieu lang
thong cong » trong cong, tong cong, thong thong
hanh mang » nhanh mang, hanh trang, nhanh lang
mang suat » nang suat, cong suat, mang cua
cong san » cong tac
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: theo chieu sang - hanh mang suat thong cong san ((toan cao) or (van ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sang - hanh mang suat thong cong san ((toan cao) OR (van ban)).
• Adding a wildcard symbol may retrieve word variants: theo chieu sang - hanh mang suat thong cong san ((toan cao) or (van ban))*.