Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
dau truc » cau truc, dai truc, doan truc
su sach » vu sach
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
nang xa » lang xa, nang ma, mang xa
so sach » so sanh, bo sach, co sach
va dau » va dao
di cua » dai cua, doi cua, de cua

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 sach)) ty ((nang xa) or (nang x)) hoi. lieu va dau truc van hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty ((nang xa) OR (nang x)) hoi. lieu va dau truc van hanh di cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ty ((nang xa) or (nang x)) hoi. lieu va dau truc van hanh di cua tre*".