Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
sang ma » nang ma, sang tao, mang may
tang ma » mang may, tang van
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
vi cau » va cau, ve cau, di cau
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((tang ma) or (sang ma)) hoi. lieu va cam ((luc va) or (tuc va)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((tang ma) OR (sang ma)) hoi. lieu va cam ((luc va) OR (tuc va)) hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((tang ma) or (sang ma)) hoi. lieu va cam ((luc va) or (tuc va)) hanh vi cau tren*.