Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
van chat » cao chat
chat duc » chat xuc, chat doc, chet duoc
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang

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) or (thu sach)) y nang xa hoi. hieu van chat duc va hanh di ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang xa hoi. hieu van chat duc va hanh di ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang xa hoi. hieu van chat duc va hanh di ((cua tre) or (cua triet))*.