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 » thien van, lieu va, hieu ve
su sach » so sach, vu sach
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa
vi cuu » vi luu, vinh cuu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tham thang ma hoi. ((hieu van) OR (hieu va)) cau ((truc va) OR (thuc va)) hanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tham thang ma hoi. ((hieu van) OR (hieu va)) cau ((truc va) or (thuc va)) hanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: su sach tham thang ma hoi. ((hieu van) OR (hieu va)) cau ((truc va) or (thuc va)) hanh vi cuu tre*.