Perhaps you should try some spelling variations:
doanh trien » doanh tien, doanh tren, doan thien
trien cua » truyen cua, trien nha, tri cua
hieu van » hieu va, thien van, lieu va
dang mai » dang hai, dang mau, dang bai
sach ky » sac ky, sach y, sach kem
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet
xac va » tac va, ac va, bac va

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 ky) or (sach ty)) dang mai hoi. hieu van nam ((xac va) or (duc va)) doanh trien cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) dang mai hoi. hieu van nam ((xac va) OR (duc va)) doanh trien cua tre.
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach ty)) dang mai hoi. hieu van nam ((xac va) or (duc va)) doanh trien cua tre*.