Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
duc van » duc va, duc tan, duc manh
hanh va » hang va, hanh vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky ((nang x) or (tang ma)) hoi. hieu van pham duc van hanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky ((nang x) OR (tang ma)) hoi. hieu van pham duc van hanh va su triet.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky ((nang x) or (tang ma)) hoi. hieu van pham duc van hanh va su triet*.