Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chau tinh » cuu tinh, ha tinh, cua tinh
nhung cau » chung cu, nhung bai, nhu cau
dung cong » dung trong
trinh va » trinh van, trinh vat, trinh ve
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap
ha chau » hat chau, a chau, lai chau

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

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