Perhaps you should try some spelling variations:
ve chinh » te chinh, va chinh, che chinh
han tai » hang tai, nhan tai, van tai
van han » van hanh, van phan, van nhan
xuc van » duc van, luc van, vuc van
va cham » va chat, va tham
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
nang xa » lang xa, nang ma, mang xa
tai va » thai va, mai va, tri va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang xa) or (nang x)) hoi. hieu ((ve chinh) or (va cham)) xuc van han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang x)) hoi. hieu ((ve chinh) OR (va cham)) xuc van han tai va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) or (nang x)) hoi. hieu ((ve chinh) or (va cham)) xuc van han tai va thiet*.