Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
van phong » van dong, hai phong
gian thai » gian thanh, gian tay, gian ha
hoc chat » hoc phat, hoc cao, hoc cua
hoc phan » hoc dan, hoc pho
va thong » va thuong, va phuong, he thong
cong dan » cong san, cong tan, huong dan

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: ((hoc chat) OR (hoc phan)) tinh - hanh trinh ((van phong) OR (va thong)) cong dan gian thai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc chat) OR (hoc phan)) tinh - hanh trinh ((van phong) or (va thong)) cong dan gian thai~".
• Adding a wildcard symbol may retrieve word variants: ((hoc chat) OR (hoc phan)) tinh - hanh trinh ((van phong) or (va thong)) cong dan gian thai*.