Perhaps you should try some spelling variations:
van quan » van ban
dat duoc » dat nuoc, da duoc, luat duoc
lang van » dang van, tang van, hoang van
nam duoc » nam thuoc, da duoc, nam moc
tu sach » thu sach, su sach, te sach
quan li » quan ly, quan tri
hieu va » lieu va, hieu qua
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay
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: tu sach ty ((lang xa) or (lang van)) hoi. hieu va ((nam duoc) OR (dat duoc)) van quan li cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((lang xa) OR (lang van)) hoi. hieu va ((nam duoc) OR (dat duoc)) van quan li cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((lang xa) or (lang van)) hoi. hieu va ((nam duoc) OR (dat duoc)) van quan li cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((lang xa) or (lang van)) hoi. hieu va ((nam duoc) OR (dat duoc)) van quan li cuu tre*.