Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat duc » chat xuc, chat doc, chet duoc
va thanh » gia thanh, ban thanh, va tinh
su sach » vu sach
so sach » so sanh, bo sach, co sach
nang co » nang cao, nang doc, nang noi
nang o » nang ho, nang ro, nang x

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