Perhaps you should try some spelling variations:
chau tinh » cuu tinh, ha tinh, cac tinh
bang cong » dang cong, bang song, hang cong
cua tinh » cua sinh, va tinh, ha tinh
hoan cua » hoa cua, han cua, doanh cua
toan cua » than cua, tan cua, doanh cua
cong tan » cong tac, cong san, cong thanh
tan chan » dan chan, ban chan, can chan
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chau tinh) or (cua tinh)) - tnhh ((hoan cua) or (toan cua)) bang cong tan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chau tinh) OR (cua tinh)) - tnhh ((hoan cua) OR (toan cua)) bang cong tan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((chau tinh) or (cua tinh)) - tnhh ((hoan cua) or (toan cua)) bang cong tan chan cau*.