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
duc manh » suc manh, duc anh, duc minh
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
xuc van » duc van, luc van, vuc van
hanh va » hang va
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thu nang ma hoa. hieu van cau ((xuc van) or (duc manh)) ((hanh vi) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu nang ma hoa. hieu van cau ((xuc van) OR (duc manh)) ((hanh vi) OR (hanh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: vu sach thu nang ma hoa. hieu van cau ((xuc van) or (duc manh)) ((hanh vi) or (hanh va)) cua tre*.