Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
van cac » van cau, van bac, dan cac
van hac » van hoc, van ha, van hai
dat van » dao van, dat va, dam van
vi cua » vai cua, di cua

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 cac) or (van hac)) dat van hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. hieu ((van cac) OR (van hac)) dat van hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ((van cac) or (van hac)) dat van hanh vi cua vat*.