Perhaps you should try some spelling variations:
xuan tuan » xuan thuan, xuan toan, xuan tan
pham xuan » pham luan, pham quang, pham van
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua
cua su » qua su

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 ky ((((nang ma) or (mang may))) or (nang cao)) hoi. hieu ve pham xuan tuan anh vi cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((((nang ma) OR (mang may))) OR (nang cao)) hoi. hieu ve pham xuan tuan anh vi cua su.
• Adding a wildcard symbol may retrieve word variants: su sach ky ((((nang ma) or (mang may))) or (nang cao)) hoi. hieu ve pham xuan tuan anh vi cua su*.