Perhaps you should try some spelling variations:
lang thai » lang chai, dang thai, lang hai
thai cua » than cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
va lang » va nang, hoa lang
cac luc » cau luc, coc luc, cac nuoc
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
tu san » thu san, tu ban, tu can
luc va » duc va, tuc va, loc va
te cac » tu cac, ve cac, te cao
te sac » te sach, te san

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

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