Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
quan tre » quan tren, quan tri, quang tri
hieu van » hieu va, thien van, lieu va
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
bo sach » co sach, hoc sach
van bao » van ban, van dao
nang xa » lang xa, nang ma, mang xa
bao xuc » bao luc, bao thuc

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

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