Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
phat vuc » phat vi, nhat vu, phat huy
te sach » toc sach
dai cuu » dai cua, dai huu
vuc van » duc van, luc van, thuc van
hieu va » hieu qua
cuu tre » cua tre, cau tren, cau treo
o hoc » co hoc, mo hoc, so hoc
o hoi » co hoi, o hai, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thu nang ((o hoi) or (o hoc)). ((hieu va) OR (lieu va)) phat vuc van hanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang ((o hoi) OR (o hoc)). ((hieu va) OR (lieu va)) phat vuc van hanh dai cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang ((o hoi) or (o hoc)). ((hieu va) OR (lieu va)) phat vuc van hanh dai cuu tre*".