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