Perhaps you should try some spelling variations:
van cham » van tham, va cham, van pham
van chat » cao chat
sach ky » sach y, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
van van » van ban, tan van, san van
van tai » von tai, van tuan
sac ky » cac ky, sai ky
tai va » thai va, mai va, tri 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: te ((sach ky) OR (sac ky)) nang xa hoi. hieu ((van cham) or (van chat)) duc van van tai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sac ky)) nang xa hoi. hieu ((van cham) OR (van chat)) duc van van tai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sac ky)) nang xa hoi. hieu ((van cham) or (van chat)) duc van van tai va thiet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sac ky)) nang xa hoi. hieu ((van cham) or (van chat)) duc van van tai va thiet*.