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
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
hanh va » hang va, hanh vi
cua tre » cua te, cuu tre, cua triet
cau xuc » cau luc, cau truc, chat xuc
nang ma » tang ma, sang ma, nang cao

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 hoa. hieu van ((cau xuc) OR (cam xuc)) van ((hanh tai) or (hanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang ma hoa. hieu van ((cau xuc) OR (cam xuc)) van ((hanh tai) OR (hanh va)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu nang ma hoa. hieu van ((cau xuc) OR (cam xuc)) van ((hanh tai) or (hanh va)) cua tre*".