Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh, van tuan
thanh ha » thanh hoa, thanh hai, nhanh ha
vien cac » vien bach, vien dai, vien da
thu sach » thuat sach, thuoc sach, thu hoach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
tu sach » su sach, te sach, tu cach
ha cua » hoa cua, hai cua, nha cua
ve cac » va cac

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) or (tu sach)) ky lang xa hoi. hieu ((ve cac) OR (vien cac)) le van thanh ha cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ky lang xa hoi. hieu ((ve cac) OR (vien cac)) le van thanh ha cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (tu sach)) ky lang xa hoi. hieu ((ve cac) OR (vien cac)) le van thanh ha cua triet".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ky lang xa hoi. hieu ((ve cac) OR (vien cac)) le van thanh ha cua triet*.