Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh dai » hanh tai, hanh dao, vanh dai
nang xa » lang xa, nang ma, mang xa
hieu va » lieu va, hieu qua
va cham » va chat, va tham
hoc van » hoc dan, hoc va, hoc vat
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
oc van » luoc van, quoc van

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) or (nang x)) hoi. hieu va cham ((oc van) OR (hoc van)) hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang x)) hoi. hieu va cham ((oc van) OR (hoc van)) hanh dai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) or (nang x)) hoi. hieu va cham ((oc van) OR (hoc van)) hanh dai cua triet*".