Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, chat xuc, cac cuoc
x hoi » xa hoi, o hoi, x ho

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