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
so sach » so sanh, bo sach, co sach
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
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: so sach ty ((lang 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: so sach ty ((lang 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: so sach ty ((lang xa) or (nang x)) hoi. hieu ((ve chinh) or (va cham)) xuc van han tai va thiet*.