Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo chieu » theo tieu, ho chieu, theo chu
chieu sang » chieu sach, chieu xanh, hieu lang
cong thanh » dong thanh, cong trinh, cong tan
trung cua » truong cua, trung tuan, trung cap
vat cong » bat cong, sat cong, vat con
toan tai » toan tap, doanh tai, toan ban
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 - thanh trung cua vat cong thanh ((toan tai) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sang - thanh trung cua vat cong thanh ((toan tai) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo chieu sang - thanh trung cua vat cong thanh ((toan tai) or (toan cao))*.