Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, cua triet
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
te sach » toc sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (thu sach)) ky lang xa hoi. hieu ve cac tuc van hanh tai ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (thu sach)) ky lang xa hoi. hieu ve cac tuc van hanh tai ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (thu sach)) ky lang xa hoi. hieu ve cac tuc van hanh tai ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (thu sach)) ky lang xa hoi. hieu ve cac tuc van hanh tai ((va triet) OR (ve triet))*.