Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van thanh » ban thanh
van tuan » van quan, van ban, anh tuan
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
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: su sach y nang x hoi. hieu va cam xuc ((van thanh) OR (van tuan)) san ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu va cam xuc ((van thanh) OR (van tuan)) san ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. hieu va cam xuc ((van thanh) OR (van tuan)) san ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu va cam xuc ((van thanh) OR (van tuan)) san ((cua tre) or (cua triet))*.