Perhaps you should try some spelling variations:
pham thang » pham thanh, pham hang, pham thuong
sach pham » sach tham, sach phat, sach phap
thang va » hang va, trang va, thong va
hieu van » hieu va, thien van, lieu va
truc vat » thuc vat, truc va, truc van
tu sach » thu sach, su sach, te sach
van cau » van dau, van hau, van chat
danh vi » dinh vi, danh di, danh va
cua tre » cua te, cuu tre, cua triet
va hoi » xa hoi, va hoc, va hoa

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