Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham duc » pham duc, cham soc, pham duy
va cham » va chat, va tham
mat cua » ma cua, manh cua, mang cua
cau cua » cau qua, ca cua, cu cua
duc van » duc va, duc tan, duc manh
su sach » so sach, vu sach
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
hieu va » lieu va, hieu qua
sach v » sach va, sach y, sach 2

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 v ((nang ma) OR (tang ma)) hoi. hieu va cham duc van hanh ((cau cua) or (mat cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang ma) OR (tang ma)) hoi. hieu va cham duc van hanh ((cau cua) OR (mat cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((nang ma) OR (tang ma)) hoi. hieu va cham duc van hanh ((cau cua) or (mat cua)) triet".
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang ma) OR (tang ma)) hoi. hieu va cham duc van hanh ((cau cua) or (mat cua)) triet*.