Perhaps you should try some spelling variations:
sach ky » sac ky, sach ty, sach kem
va pham » van pham, va phat, va phan
va phap » va phat, ban phap
duc van » duc va, duc tan, duc manh
van anh » van thanh, tuan anh, van minh
su viet » so viet
anh vi » hanh vi, anh va, anh ve
vi su » va su, ve su, ki su

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 y)) nang x ho. hieu ((va pham) or (va phap)) duc van anh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang x ho. hieu ((va pham) OR (va phap)) duc van anh vi su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) nang x ho. hieu ((va pham) or (va phap)) duc van anh vi su viet".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) nang x ho. hieu ((va pham) or (va phap)) duc van anh vi su viet*.