Perhaps you should try some spelling variations:
cac viet » cach viet, bac viet, ca viet
hanh va » hang va, hanh vi
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
te sach » toc sach
mang xa » lang xa, mang may, dang xay
ve cham » va cham, ve chat, vu cham
xac va » tac va, ac va, bac va
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((mang xa) or (nang x)) hoi. hieu ve cham ((xac va) or (loc va)) hanh va cac viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((mang xa) OR (nang x)) hoi. hieu ve cham ((xac va) OR (loc va)) hanh va cac viet.
• Adding a wildcard symbol may retrieve word variants: te sach ky ((mang xa) or (nang x)) hoi. hieu ve cham ((xac va) or (loc va)) hanh va cac viet*.