Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
hanh va » hang va
duc van » duc va, duc tan, duc manh
xuc van » luc van, xuc ban, thuc van
van cau » van dau, van hau, van chat
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
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 thu nang ma hoi. hieu van cau ((xuc van) or (duc van)) ((hanh vi) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang ma hoi. hieu van cau ((xuc van) OR (duc van)) ((hanh vi) OR (hanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach thu nang ma hoi. hieu van cau ((xuc van) or (duc van)) ((hanh vi) or (hanh va)) cua tre*.