Perhaps you should try some spelling variations:
dan thanh » dang thanh, danh thanh, ban thanh
thanh loi » thanh hoa, thanh hai, thanh lap
tac dung » sach dung, xay dung, tin dung
dung dan » dung dat, dung san, tung dan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cua tre » cua triet, dua tren, cua thep
cuu tre » cau tren, cau treo
ve tac » va tac, ve cac, ve tai
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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 nang x hoi. hieu ve tac dung dan thanh loi ((((cua tre) OR (cuu tre))) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. hieu ve tac dung dan thanh loi ((((cua tre) OR (cuu tre))) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x hoi. hieu ve tac dung dan thanh loi ((((cua tre) OR (cuu tre))) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. hieu ve tac dung dan thanh loi ((((cua tre) OR (cuu tre))) or (cua te))*.