Perhaps you should try some spelling variations:
pham day » phap day, pham duy, pham xay
su sach » so sach, vu sach
cuu tre » cau tren, cau treo
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
ve pham » vi pham, v pham, ve phan
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
cua tre » cua te, cua triet, dua tren

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 ly ((nang ma) or (tang ma)) hoi. hieu ve pham day va hanh di ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((nang ma) OR (tang ma)) hoi. hieu ve pham day va hanh di ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: su sach ly ((nang ma) or (tang ma)) hoi. hieu ve pham day va hanh di ((cuu tre) or (cua tre))*.