Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
sang ma » tang ma, nang ma, sang tao
va cham » va chat, va tham
soc van » hoc van, oc van, sac van
vi dau » vi dai, bi dau, ve dau
va dau » va dao

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 ((nang xa) or (sang ma)) hoi. lieu va cham soc van hanh ((vi dau) OR (va dau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang xa) OR (sang ma)) hoi. lieu va cham soc van hanh ((vi dau) OR (va dau)) tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((nang xa) or (sang ma)) hoi. lieu va cham soc van hanh ((vi dau) OR (va dau)) tren*".