Perhaps you should try some spelling variations:
hieu phan » phieu phan, lieu phan, hieu pham
phan dau » phan tu, hang dau
sinh de » sinh dh, sinh dai
minh de » menh de, minh ve, minh di
luc van » luoc van, luu van, duc van
dau luc » cau luc, dau luan, dau nuoc
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2

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 v ((nang xa) or (nang ma)) hoi. hieu phan dau luc van ((minh de) OR (sinh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v ((nang xa) OR (nang ma)) hoi. hieu phan dau luc van ((minh de) OR (sinh de)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v ((nang xa) or (nang ma)) hoi. hieu phan dau luc van ((minh de) OR (sinh de)) cua tre*".