Perhaps you should try some spelling variations:
hoc chuyen » khong chuyen
khach tin » khach san, hanh tin
thuc bach » truc bach, thuc cach, thuoc sach
bach khoa » anh khoa
chan dung » van dung
vu khach » vu khanh, vu khac, vay khach
dan dung » van dung, tin dung, ap dung
tin hoc » sinh hoc
tinh » trinh, dinh, minh

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu khach tin hoc chuyen đe ky thuat: kien thuc bach khoa ((chan dung) or (dan dung)) may tinh~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu khach tin hoc chuyen đe ky thuat: kien thuc bach khoa ((chan dung) OR (dan dung)) may tinh.
• Adding a wildcard symbol may retrieve word variants: vu khach tin hoc chuyen đe ky thuat: kien thuc bach khoa ((chan dung) or (dan dung)) may tinh*.