Perhaps you should try some spelling variations:
hien tinh » khien tinh, thien tinh, dien tinh
bien tinh » bi tinh, yen tinh, diep tinh
trang cua » tang cua, trung cua, thang cua
tranh cua » doanh cua, manh cua
cong tac » cong ty
tac chan » tac chuan, tac can, tac chon
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 ((hien tinh) or (bien tinh)) - hanh ((trang cua) or (tranh cua)) trong cong tac chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien tinh) OR (bien tinh)) - hanh ((trang cua) OR (tranh cua)) trong cong tac chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tinh) or (bien tinh)) - hanh ((trang cua) or (tranh cua)) trong cong tac chan cau*.