Perhaps you should try some spelling variations:
thien van » thi van
sach van » sach han, sach va, bach van
van nang » van quang, van ban, van dong
hieu van » hieu va, lieu va, hieu ve
cau thuc » cau truc, cuu thuc, can thuc
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hanh le » thanh le, hanh ve, hanh de
cua tre » cua te, cuu tre, cua triet
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach van nang xa hoi. ((hieu van) or (thien van)) cau thuc van hanh le cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach van nang xa hoi. ((hieu van) OR (thien van)) cau thuc van hanh le cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach van nang xa hoi. ((hieu van) or (thien van)) cau thuc van hanh le cua tre*.