Perhaps you should try some spelling variations:
thanh than » thanh thanh, thanh thang, thanh toan
than cua » nhan cua, thai cua, ban cua
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
bao tuc » bao thuc, dao tuc, bao luc
van bao » van ban, van dao
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach kem
nang xa » lang xa, nang ma, mang xa
sach ty » sach y, sach tu, sach thu
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sach ty)) ((nang xa) OR (nang x)) hoi. hieu van bao tuc va thanh than cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) ((nang xa) OR (nang x)) hoi. hieu van bao tuc va thanh than cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sach ty)) ((nang xa) OR (nang x)) hoi. hieu van bao tuc va thanh than cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) ((nang xa) OR (nang x)) hoi. hieu van bao tuc va thanh than cua tre*.