Perhaps you should try some spelling variations:
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
ve cham » va cham, vu cham, ve chim
ve chat » va chat, van chat
han mai » han tai, ban mai, han mac
va han » va phan, van han, va hanh
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 (lang xa)) hoi. hieu ((ve cham) or (ve chat)) duc va han mai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang xa)) hoi. hieu ((ve cham) OR (ve chat)) duc va han mai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) OR (lang xa)) hoi. hieu ((ve cham) or (ve chat)) duc va han mai va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) OR (lang xa)) hoi. hieu ((ve cham) or (ve chat)) duc va han mai va thiet*.