Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
pham duy » pham duc
so sach » so sanh, bo sach, co sach
va hanh » va thanh, va danh, ban hanh
va pham » van pham, va phat, va phap
sach ly » sach y, sach lo, sach ty
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
tang ma » mang may, tang van
cua tre » cua te, cuu tre, cua triet
de cua » le cua, te cua, dieu cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ly ((nang xa) or (tang ma)) hoi. hieu va pham duy ((va hanh) or (van hanh)) de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ly ((nang xa) OR (tang ma)) hoi. hieu va pham duy ((va hanh) OR (van hanh)) de cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ly ((nang xa) or (tang ma)) hoi. hieu va pham duy ((va hanh) or (van hanh)) de cua tre*.