Perhaps you should try some spelling variations:
nang xa » nang x, lang xa, nang ma
dan bac » dan ba, van bac, dong bac
van hac » van hoc, van ha, van hai
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
di ve » dai ve, de ve, di le
do ve » dao ve, do ke, de ve

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 ((dan bac) or (van hac)) truc va danh ((di ve) OR (do ve)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu ((dan bac) OR (van hac)) truc va danh ((di ve) OR (do ve)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang xa hoi. hieu ((dan bac) or (van hac)) truc va danh ((di ve) OR (do ve)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu ((dan bac) or (van hac)) truc va danh ((di ve) OR (do ve)) triet*.