Perhaps you should try some spelling variations:
hoang van » hang va
thu sach » tu sach, thuat sach, thuoc sach
van quan » van ban
duoc van » duoc va, duc van, duoc ban
quan li » quan ly, quan tri
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
cuu tre » cua tre, cau tren, cau treo
va dau » va dao
va da » va dao, va dap, va dai

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty ((lang xa) or (hoang van)) hoi. hieu ((va da) OR (va dau)) duoc van quan li cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((lang xa) OR (hoang van)) hoi. hieu ((va da) OR (va dau)) duoc van quan li cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((lang xa) or (hoang van)) hoi. hieu ((va da) OR (va dau)) duoc van quan li cuu tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((lang xa) or (hoang van)) hoi. hieu ((va da) OR (va dau)) duoc van quan li cuu tre*.