Perhaps you should try some spelling variations:
khanh tai » thanh tai, hanh tai, nhanh thai
hieu van » hieu va, thien van, lieu va
mang cua » manh cua, dung cua, ban cua
dang xay » dang van, van xay
xa khanh » xa thanh, van khanh, dat khanh
tu sach » thu sach, su sach, te sach
tai cua » thai cua, tai cuc, tri cua
cau tuc » cau truc, cau tu, cau luc
van cau » van dau, van hau, van chat
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((((mang cua) or (dang xay))) or (nang x)) hoi. hieu van cau tuc xa khanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((((mang cua) OR (dang xay))) OR (nang x)) hoi. hieu van cau tuc xa khanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((((mang cua) or (dang xay))) or (nang x)) hoi. hieu van cau tuc xa khanh tai cua tre*.