Perhaps you should try some spelling variations:
danh thanh » dinh thanh, dang thanh, nhanh thanh
xanh hanh » ban hanh, van hanh, dang hanh
dua tren » dung tren
thu sach » tu sach, thuat sach, thuoc sach
cao suc » cao su, cao duc
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cao » va cao, ve bao, ve cac
cua te » cua tu

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 ky lang xa hoi. hieu ve cao suc ((xanh hanh) OR (danh thanh)) tai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky lang xa hoi. hieu ve cao suc ((xanh hanh) OR (danh thanh)) tai ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky lang xa hoi. hieu ve cao suc ((xanh hanh) OR (danh thanh)) tai ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky lang xa hoi. hieu ve cao suc ((xanh hanh) OR (danh thanh)) tai ((dua tren) or (cua te))*.