Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dau tien » van tien
mang xa » lang xa, mang may, dang xay
nang ma » tang ma, sang ma, nang cao
va chat » van chat, va phat, cao chat
soc van » oc van, sac van, soc dan
hoc van » hoc dan, hoc va, hoc vat
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 y ((mang xa) or (nang ma)) hoi. lieu va chat ((soc van) OR (hoc van)) hanh vi dau tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((mang xa) OR (nang ma)) hoi. lieu va chat ((soc van) OR (hoc van)) hanh vi dau tien*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y ((mang xa) or (nang ma)) hoi. lieu va chat ((soc van) OR (hoc van)) hanh vi dau tien*".