Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
hoac khong » hoa khong, hoc khong, hay khong
hua khong » hoa khong, cua khong, phuc khong
theo chu » theo chieu, cho chu, chao chu
canh dan » canh van, sanh dan, thanh dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan tap
chu van » cuu van, chu han

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

• If you are trying to use Boolean operators, they must be ALL CAPS: theo chu van - hanh trinh ((hua khong) OR (hoac khong)) canh dan than tap~.
• Adding a wildcard symbol may retrieve word variants: theo chu van - hanh trinh ((hua khong) or (hoac khong)) canh dan than tap*.