Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
van hac » van hoc, van ha, van hai
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, dua tren
hac de » hoc de, tac de, hat de
de va » de van, te va, ke va
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) or (thuat sach)) ty nang x hoi. hieu van hac de va hanh de ((cua triet) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thuat sach)) ty nang x hoi. hieu van hac de va hanh de ((cua triet) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thuat sach)) ty nang x hoi. hieu van hac de va hanh de ((cua triet) or (cua tre))*.