Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
hanh trinh » canh tranh, hanh chinh
quan tre » quan tren, quan tri, quang tri
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
bao xuc » bao luc, bao thuc
van bao » van ban, van dao
sach ky » sac ky, sach y, sach kem
nang xa » lang xa, nang ma, mang xa
sach ty » sach y, sach tu, sach thu
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) OR (sach ty)) ((nang xa) or (nang x)) hoi. hieu van bao xuc va hanh trinh quan tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach ty)) ((nang xa) OR (nang x)) hoi. hieu van bao xuc va hanh trinh quan tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sach ty)) ((nang xa) or (nang x)) hoi. hieu van bao xuc va hanh trinh quan tre*".