Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, dua tren
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
o hoi » co hoi, o hoc, o hai

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) or (toc sach)) ky nang o hoi. hieu va cam xuc va thanh dai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) ky nang o hoi. hieu va cam xuc va thanh dai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (toc sach)) ky nang o hoi. hieu va cam xuc va thanh dai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (toc sach)) ky nang o hoi. hieu va cam xuc va thanh dai ((cua tre) OR (cua triet))*.