Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thanh nam » hanh nam, thanh tam, thanh pham
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
cau duc » cao duc, cau luc, chu duc
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
so lai » so loai, so lam, so lao
va cau » van cau, va cac, va dau
o lai » o lao

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 lai) or (so lai)). hieu va cau duc va thanh nam ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((o lai) OR (so lai)). hieu va cau duc va thanh nam ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang ((o lai) or (so lai)). hieu va cau duc va thanh nam ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((o lai) or (so lai)). hieu va cau duc va thanh nam ((cua triet) OR (su triet))*.