Perhaps you should try some spelling variations:
tay vung » tay nung, thai vung, tu vung
dinh cuu » dinh chi
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cuu tre » cua tre, cau tren, cau treo
hieu ve » hieu va, hieu van
ve chat » va chat, van chat
sai tay » dai tay, san tay, thai tay
ha hoi » hoa hoi, ha noi, xa hoi
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai tay vung ((ha hoi) or (hoa hoc)). hieu ve chat luong ((van hanh) OR (ban hanh)) dinh cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai tay vung ((ha hoi) OR (hoa hoc)). hieu ve chat luong ((van hanh) OR (ban hanh)) dinh cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai tay vung ((ha hoi) or (hoa hoc)). hieu ve chat luong ((van hanh) OR (ban hanh)) dinh cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sai tay vung ((ha hoi) or (hoa hoc)). hieu ve chat luong ((van hanh) OR (ban hanh)) dinh cuu tre*.