Perhaps you should try some spelling variations:
duy hoang » huy hoang, duc hoang, duy thong
ky hoang » huy hoang, ky nang, ky dang
le hoang » le hong, le quang, le tang
te sach » toc sach
van hoc » van hoa
qua dat » quy dat, qua da, qua dan
va hanh » van hanh, va thanh, va danh
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua
nuoc » quoc, duoc, ngoc

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 ((((ky hoang) OR (le hoang))) or (duy hoang)) van hoc. hieu qua dat nuoc va hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((((ky hoang) OR (le hoang))) OR (duy hoang)) van hoc. hieu qua dat nuoc va hanh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((((ky hoang) OR (le hoang))) or (duy hoang)) van hoc. hieu qua dat nuoc va hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ((((ky hoang) OR (le hoang))) or (duy hoang)) van hoc. hieu qua dat nuoc va hanh di cua tre*.