Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
su sach » so sach
vu sach » vu bach, vu khach
ty hang » ly hang, ty xang, thi hang
hang ca » hang va, nang cao, hang tai
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
ca hoi » cau hoi, cua hoi, xa hoi
vi cua » vai cua, di cua

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 (vu sach)) ty hang ca hoi. hieu van cau truc van hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ty hang ca hoi. hieu van cau truc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ty hang ca hoi. hieu van cau truc van hanh vi cua tre*.