Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
sach ty » sach y, sach tu, sach thu
va cao » va cac, va dao, va bao
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai
va co » vo co

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 ty nang o hai. lieu ((va cao) OR (va co)) truc va hanh vai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang o hai. lieu ((va cao) OR (va co)) truc va hanh vai ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang o hai. lieu ((va cao) OR (va co)) truc va hanh vai ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang o hai. lieu ((va cao) OR (va co)) truc va hanh vai ((cua triet) or (cua viet))*.