Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, chat xuc, cac cuoc
tu sach » thu sach, su sach, te sach
nang xa » lang xa, nang ma, mang xa
sach ky » sac ky, sach y, sach ty
tai va » thai va, mai va, tri va

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

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