Perhaps you should try some spelling variations:
thien van » thi van
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
bac tuc » bac tu, bach tuoc, bac thua
van bac » van ban, van bao, van hac
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
so sanh » do sanh
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) or (so sanh)) v ((nang xa) OR (nang x)) hoi. thien van bac tuc va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) v ((nang xa) OR (nang x)) hoi. thien van bac tuc va hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) v ((nang xa) OR (nang x)) hoi. thien van bac tuc va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) v ((nang xa) OR (nang x)) hoi. thien van bac tuc va hanh doi cua tre*.