Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
hieu van » hieu va, thien van, lieu va
thuc dan » thuc hanh, hoc dan, thuc vat
thang ma » thang mua, tang ma, thang va
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
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: ((tu sach) or (su sach)) thanh thang ma hoi. hieu van cau ((truc va) or (thuc dan)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) thanh thang ma hoi. hieu van cau ((truc va) OR (thuc dan)) hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) thanh thang ma hoi. hieu van cau ((truc va) or (thuc dan)) hanh vi cua tre*.