Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
thien van » thi van
lang van » dang van, tang van, hoang van
su sach » so sach, vu sach
dat cua » dai cua, day cua, mat cua
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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 y ((lang xa) OR (lang van)) hoi. thien van cam ((xuc va) or (tuc va)) thanh dat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((lang xa) OR (lang van)) hoi. thien van cam ((xuc va) OR (tuc va)) thanh dat cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((lang xa) OR (lang van)) hoi. thien van cam ((xuc va) or (tuc va)) thanh dat cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((lang xa) OR (lang van)) hoi. thien van cam ((xuc va) or (tuc va)) thanh dat cua tre*.