Perhaps you should try some spelling variations:
chau tinh » cuu tinh, ha tinh, cua tinh
dung cong » dung trong
trinh tra » trinh ra, trinh tro, trinh tru
trang va » tran van, hang va
ho chau » ha chau, ho chu, o chau
tang va » tang van, thang va, tang vat
tra cau » tra sau, ta cau, tra cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chau tinh - hanh ((tang va) or (trang va)) dung cong trinh tra cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chau tinh - hanh ((tang va) OR (trang va)) dung cong trinh tra cau.
• Adding a wildcard symbol may retrieve word variants: ho chau tinh - hanh ((tang va) or (trang va)) dung cong trinh tra cau*.