Perhaps you should try some spelling variations:
sach thue » sach thieu, sach tham, cach thuc
va triet » va thiet, va trien, ve triet
sach thu » sach thieu, sach tham, cach thuc
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
anh vi » hanh vi, anh va, anh ve
vi va » vi van, vai va, vu va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thu) OR (sach thue)) nang ma hoi. hieu va cam ((xuc van) OR (duc van)) anh vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thu) OR (sach thue)) nang ma hoi. hieu va cam ((xuc van) or (duc van)) anh vi va triet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thu) OR (sach thue)) nang ma hoi. hieu va cam ((xuc van) or (duc van)) anh vi va triet*.