Perhaps you should try some spelling variations:
tuan than » thuan thanh, quan thanh, tran thanh
than cua » nhan cua, thai cua, ban cua
van tuan » van quan, van ban, anh tuan
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cua tre » cua te, cuu tre, cua triet
cac luc » cau luc, coc luc, cac cuoc
hieu ve » hieu va, hieu van
tu bat » tu ban, tu dat
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
o lai » o lao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu bat) or (tu san)) ky nang o lai. hieu ve ((cac luc) OR (cac nuoc)) van tuan than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bat) OR (tu san)) ky nang o lai. hieu ve ((cac luc) OR (cac nuoc)) van tuan than cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu bat) or (tu san)) ky nang o lai. hieu ve ((cac luc) OR (cac nuoc)) van tuan than cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu bat) or (tu san)) ky nang o lai. hieu ve ((cac luc) OR (cac nuoc)) van tuan than cua tre*.