Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thu sach » tu sach, thuat sach, thu hoach
van hanh » van thanh, ban hanh, van anh
dau tien » van tien
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
va cham » va chat, va tham
soc van » hoc van, oc van, sac van
vi dau » vi dai, va dau, bi dau

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