Perhaps you should try some spelling variations:
van cham » van tham, va cham, van pham
van chat » cao chat
nhan mai » nhan tai, nhan dai, nhan ma
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
va nhan » van nhan, ca nhan, va phan
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: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu ((van cham) or (van chat)) xuc va nhan mai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu ((van cham) OR (van chat)) xuc va nhan mai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (lang xa)) hoi. hieu ((van cham) or (van chat)) xuc va nhan mai va thiet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) OR (lang xa)) hoi. hieu ((van cham) or (van chat)) xuc va nhan mai va thiet*.