Perhaps you should try some spelling variations:
thien van » thi van
thu sach » tu sach, thuat sach, thuoc sach
dang xay » dang van, van xay
dao thi » do thi, dan thi, dang thi
cuc tre » duc tre, cua tre, cuc thue
cuu tre » cua tre, cau tren, cau treo
van cac » van hac, van cau, van bac
xay hoi » xa hoi, tay hoi, cay phoi
tuc va » thuc va, truc va, duc va
y dang » ky dang, 2 dang, _ dang

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 y dang xay hoi. thien van cac ((tuc va) OR (tuc xa)) dao thi ((cuc tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y dang xay hoi. thien van cac ((tuc va) OR (tuc xa)) dao thi ((cuc tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y dang xay hoi. thien van cac ((tuc va) OR (tuc xa)) dao thi ((cuc tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach y dang xay hoi. thien van cac ((tuc va) OR (tuc xa)) dao thi ((cuc tre) or (cuu tre))*.