Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
dan thai » dang thai, dan than, ban thai
lang van » dang van, tang van, hoang van
dan thi » dang thi, tran thi, dinh thi
van dat » van dao, van dau, dan dat
sach ky » sac ky, sach y, sach ty
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay
cuu tre » cua tre, cau tren, cau treo
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: tu sach ky ((lang xa) or (lang van)) hoi. hieu van dat nuoc va ((dan thai) OR (dan thi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (lang van)) hoi. hieu van dat nuoc va ((dan thai) OR (dan thi)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang xa) or (lang van)) hoi. hieu van dat nuoc va ((dan thai) OR (dan thi)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (lang van)) hoi. hieu van dat nuoc va ((dan thai) OR (dan thi)) cuu tre*.