Perhaps you should try some spelling variations:
dong thanh » truong thanh
dang thanh » dang hanh, hoang thanh, quang thanh
tu sach » thu sach, su sach, te sach
tai cuu » tai cuc, tai buu, tai cua
cuu tre » cua tre, cau tren, cau treo
cam suc » cam xuc, cao suc, cham soc
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
ve cam » ve cham, ve cac, va cam

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) OR (ky tang)) xa hoi. hieu ve cam suc ((dang thanh) or (dong thanh)) tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky tang)) xa hoi. hieu ve cam suc ((dang thanh) OR (dong thanh)) tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky tang)) xa hoi. hieu ve cam suc ((dang thanh) or (dong thanh)) tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky tang)) xa hoi. hieu ve cam suc ((dang thanh) or (dong thanh)) tai cuu tre*.