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