Perhaps you should try some spelling variations:
tham thang » pham thang, thanh thang, pham thanh
sach tham » sach nha
thang ma » thang mua, tang ma, thang va
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
cuu tre » cau tren, cau treo
truc va » thuc vat, trung va
cua tre » cua te, cua triet, dua tren
van cau » van dau, van hau, van chat
ma hoi » mai hoi, xa hoi, ma hoa

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 tham thang ma hoi. hieu van cau ((truc va) or (thuc va)) hanh vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tham thang ma hoi. hieu van cau ((truc va) OR (thuc va)) hanh vi ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: su sach tham thang ma hoi. hieu van cau ((truc va) or (thuc va)) hanh vi ((cuu tre) or (cua tre))*.