Perhaps you should try some spelling variations:
hoang van » hang va
van quan » van ban
duoc van » duoc va, duc van, duoc ban
nam duoc » nam thuoc, da duoc, dat duoc
su sach » so sach, vu sach
quan li » quan ly, quan tri
sach tu » sach thu, cach tu, sach ty
hieu va » hieu qua
lang xa » lang ha, dang xay, lang van
cuu tre » cua tre, cau tren, cau treo

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