Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
ban thai » ban than, ban tai, ban thoi
ban thi » dan thi, van thi, can thi
xuc van » duc van, luc van, vuc van
cac xuc » cam xuc, cac nuoc, chat xuc
cua tre » cua te, cuu tre, cua triet
nang co » nang cao, nang doc, nang noi
co lai » con lai, o lai, co dai
tu san » thu san, tu ban, tu can
tu sac » tu sach, tu cac, tu bac

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) or (tu san)) ky nang co lai. hieu viec cac xuc van ((ban thai) OR (ban thi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu san)) ky nang co lai. hieu viec cac xuc van ((ban thai) OR (ban thi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu san)) ky nang co lai. hieu viec cac xuc van ((ban thai) OR (ban thi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu san)) ky nang co lai. hieu viec cac xuc van ((ban thai) OR (ban thi)) cua tre*.