Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
lo nang » ly nang, loai nang, cao nang
ho nang » thi nang, kha nang, cao nang
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, co sach
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
xac va » tac va, ac va, bac va
vi cau » va cau, ve cau, di cau

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 ((lo nang) OR (ho nang)) ma hoi. hieu ve cam ((xac va) or (duc va)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((lo nang) OR (ho nang)) ma hoi. hieu ve cam ((xac va) OR (duc va)) hanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((lo nang) OR (ho nang)) ma hoi. hieu ve cam ((xac va) or (duc va)) hanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: so sach ((lo nang) OR (ho nang)) ma hoi. hieu ve cam ((xac va) or (duc va)) hanh vi cau tren*.