Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
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
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, dua tren
va dan » ca dan, va dao, va dau
dan di » danh di, dan da, dan de

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)) truc va dan di ((cua tre) or (cua triet))~.
• 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)) truc va dan di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. hieu ((van cac) OR (van hac)) truc va dan di ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ((van cac) OR (van hac)) truc va dan di ((cua tre) or (cua triet))*.