Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van bau
dan bac » dan ba, dong bac, gian bac
van hac » van hoc, van ha, van hai
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh le » dinh le, manh le, anh le
cua tre » cua te, cuu tre, cua triet
le cua » ly cua

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 ky nang xa hoi. hieu ((((van bac) or (dan bac))) or (van hac)) truc va danh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((((van bac) OR (dan bac))) OR (van hac)) truc va danh le cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((((van bac) or (dan bac))) or (van hac)) truc va danh le cua tre*.