Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
nhan cua » nhat cua, nhan luc, nhan su
than cua » thai cua, ban cua, gian cua
cac luc » cau luc, coc luc, cac nuoc
hieu ve » hieu va, hieu van
luc van » luoc van, luu van, duc van
tu dat » tu bat
nang o » nang co, nang ho, nang ro
tu san » thu san, tu ban, tu can
ve cac » va cac, vien cac
o lao » o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu dat) or (tu san)) ky nang o lao. hieu ve cac luc van thanh ((than cua) or (nhan cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu dat) OR (tu san)) ky nang o lao. hieu ve cac luc van thanh ((than cua) OR (nhan cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((tu dat) or (tu san)) ky nang o lao. hieu ve cac luc van thanh ((than cua) or (nhan cua)) tre*.