Perhaps you should try some spelling variations:
van chat » cao chat
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, ve chat, vu cham
han mac » nhan mac, ban mach, hanh mau
xuc va » duc va, tuc va, luc va
va han » va phan, van han, va hanh
mac va » mac ca, tac va, ac 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 (lang xa)) hoi. hieu ((ve cham) or (van chat)) xuc va han mac 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 (van chat)) xuc va han mac 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 (van chat)) xuc va han mac va thiet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) OR (lang xa)) hoi. hieu ((ve cham) or (van chat)) xuc va han mac va thiet*.