Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
truc va » thuc va, thuc vat, trung va
han mai » han tai, ban mai, han mac
xuc va » duc va, tuc va, luc 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 cham ((xuc va) or (truc va)) han mai 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 cham ((xuc va) OR (truc va)) han mai va thiet.
• Adding a wildcard symbol may retrieve word variants: vu sach y ((nang xa) or (nang x)) hoi. hieu ve cham ((xuc va) or (truc va)) han mai va thiet*.