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