Perhaps you should try some spelling variations:
xach tay » canh tay
nang dau » hang dau, xang dau, nang cao
danh tai » doanh tai, dinh tai, hanh tai
hieu van » hieu va, thien van, lieu va
tai cua » thai cua, tai cuc, tri cua
va danh » va dinh, va dan, va hanh
nam luc » nang luc, nhan luc, nam thuc
cua tre » cua te, cuu tre, cua triet
nang du » nang tu, nang luc, nang doc
luc va » duc va, tuc va, loc va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach y) OR (xach tay)) ((nang dau) OR (nang du)) hoi. hieu van nam luc va danh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach y) or (xach tay)) ((nang dau) OR (nang du)) hoi. hieu van nam luc va danh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su ((sach y) or (xach tay)) ((nang dau) OR (nang du)) hoi. hieu van nam luc va danh tai cua tre*.