Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van cham » van chat, van tham, va cham
hieu van » hieu va, thien van, lieu va
nang xa » nang x, lang xa, nang ma
sach ky » sac ky, sach y, sach ty
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
vu va » vu van, tu va
su va » su van, tu va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. hieu van cham ((luc va) or (tuc va)) hanh ((vu va) OR (su va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu van cham ((luc va) OR (tuc va)) hanh ((vu va) OR (su va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu van cham ((luc va) or (tuc va)) hanh ((vu va) OR (su va)) triet".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu van cham ((luc va) or (tuc va)) hanh ((vu va) OR (su va)) triet*.