Perhaps you should try some spelling variations:
va tuyen » va truyen, tac tuyen, ke tuyen
va trien » va truyen, va thiet, va tieng
van hanh » van thanh, ban hanh, van anh
tang van » dang van, hoang van, trong van
hanh vu » hanh vi, hanh va, hanh tu
so sach » bo sach, co sach, hoc sach
van hoe » van hoa, van hoc, van hieu
ty tang » tay tang, ty xang, ty hang
so sanh » do sanh
qua cam » qua cham, qua cac, qua ca
cam lo » nam lo, cam ly, cam o
lo van » le van, vo van, so van

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) or (so sanh)) ty tang van hoe. hieu qua cam lo van hanh vu ((va trien) OR (va tuyen))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ty tang van hoe. hieu qua cam lo van hanh vu ((va trien) OR (va tuyen)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) ty tang van hoe. hieu qua cam lo van hanh vu ((va trien) OR (va tuyen))".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) ty tang van hoe. hieu qua cam lo van hanh vu ((va trien) OR (va tuyen))*.