Perhaps you should try some spelling variations:
nang hanh » nang thanh, dang hanh, nang hang
dau luan » dan luan, dat luan, khau luan
nang han » nang phan, nang hang, nang ban
hanh tai » thanh tai, hang tai, han tai
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
dau luc » cau luc, dau nuoc, dau luot
su tai » su thi, tu tai
tai ky » thai ky, trai ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: su tai ky ((nang han) or (nang hanh)) hoi. lieu va ((dau luc) or (dau luan)) va hanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su tai ky ((nang han) OR (nang hanh)) hoi. lieu va ((dau luc) OR (dau luan)) va hanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: su tai ky ((nang han) or (nang hanh)) hoi. lieu va ((dau luc) or (dau luan)) va hanh tai cua tre*.