Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh hai » tinh thai, tinh chat, trinh han
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hau duc » huu duc, ha duc, pham duc
va tinh » may tinh
hai cua » thai cua, dai cua, hoi cua
mo hoc » mon hoc, co hoc
va hau » van hau, va chau, vat hau
o hoc » co hoc, so hoc, y hoc

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 ((o hoc) OR (mo hoc)). lieu va hau duc va tinh hai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoc) OR (mo hoc)). lieu va hau duc va tinh hai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoc) OR (mo hoc)). lieu va hau duc va tinh hai cua triet*.