Perhaps you should try some spelling variations:
nguoi san » nguoi tay, nguoi dao, nguoi ma
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
cam hoc » cao hoc, am hoc, cam hoa
tai cua » thai cua, tai cuc, tri cua
te sach » toc sach
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
hoc van » hoc dan, hoc va, hoc vat
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nguoi san) or (te sach)) ky ((mang xa) or (nang ma)) hoi. hieu ve cam hoc van hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nguoi san) OR (te sach)) ky ((mang xa) OR (nang ma)) hoi. hieu ve cam hoc van hanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: ((nguoi san) or (te sach)) ky ((mang xa) or (nang ma)) hoi. hieu ve cam hoc van hanh tai cua te*.