Perhaps you should try some spelling variations:
van thanh » ban thanh
cua triet » cua viet, su triet, va triet
van tuan » van quan, van ban, anh tuan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
lai cua » dai cua, hai cua, lai chau
va cam » va cham, va cac, va cao
5 hoi » o hoi

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 ((5 hoi) or (x ho)). hieu va cam duc ((van thanh) OR (van tuan)) lai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((5 hoi) OR (x ho)). hieu va cam duc ((van thanh) OR (van tuan)) lai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((5 hoi) or (x ho)). hieu va cam duc ((van thanh) OR (van tuan)) lai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((5 hoi) or (x ho)). hieu va cam duc ((van thanh) OR (van tuan)) lai cua triet*.