Perhaps you should try some spelling variations:
van cham » van chat, van tham, van pham
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va cham » va chat, va tham
truc va » thuc va, thuc vat, trung va
van tai » von tai, van tuan
tai va » thai va, mai va, tri va

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 hoi. hieu ((van cham) or (va cham)) truc va van tai va (thiet or thieu)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((van cham) OR (va cham)) truc va van tai va (thiet OR thieu).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((van cham) or (va cham)) truc va van tai va (thiet or thieu)*.