Perhaps you should try some spelling variations:
khang sinh » nhan sinh
thanh binh » thai binh, than kinh, tinh binh
cac cuoc » cac nuoc, ca cuoc, cac quoc
cua tre » cua te, cuu tre, cua triet
cac vuc » cac nuoc, cac vung, cac quoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang xa hoi. hieu va ((cac vuc) OR (cac cuoc)) van ((khang sinh) or (thanh binh)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu va ((cac vuc) OR (cac cuoc)) van ((khang sinh) OR (thanh binh)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu va ((cac vuc) OR (cac cuoc)) van ((khang sinh) or (thanh binh)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu va ((cac vuc) OR (cac cuoc)) van ((khang sinh) or (thanh binh)) cua tre*.