Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
cham luc » cham soc, nhan luc, cham cuu
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
sach 6 » sach 2
dau va » dau ve, lau va

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 6) or (sach y)) tang ma hoi. hieu ve cham luc ((va danh) OR (va hanh)) dau va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach 6) OR (sach y)) tang ma hoi. hieu ve cham luc ((va danh) OR (va hanh)) dau va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach 6) or (sach y)) tang ma hoi. hieu ve cham luc ((va danh) OR (va hanh)) dau va trien".
• Adding a wildcard symbol may retrieve word variants: te ((sach 6) or (sach y)) tang ma hoi. hieu ve cham luc ((va danh) OR (va hanh)) dau va trien*.