Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
vien cac » vien bach, vien dai, vien da
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
va hang » van hang, va nang, va lang
cua tre » cua te, cuu tre, dua tren
ve cac » va cac
lo va » lo van, lao va, ly 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 ((ve cac) or (vien cac)) lo va hang va ((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 ((ve cac) OR (vien cac)) lo va hang va ((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 ((ve cac) or (vien cac)) lo va hang va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. hieu ((ve cac) or (vien cac)) lo va hang va ((cua tre) OR (cua triet))*.