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

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 (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 (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 (tu san)) ky tang xa hoi. hieu va cac luc va lang thai cua tre*.