Perhaps you should try some spelling variations:
su sach » so sach, vu sach
han tai » hang tai, nhan tai, van tai
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
nang xa » lang xa, nang ma, mang xa
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc 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 y ((nang xa) or (nang x)) hoi. hieu vu cham ((xuc va) or (tuc va)) han tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (nang x)) hoi. hieu vu cham ((xuc va) OR (tuc va)) han tai va thiet.
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (nang x)) hoi. hieu vu cham ((xuc va) or (tuc va)) han tai va thiet*.