Perhaps you should try some spelling variations:
thien van » thi van
xuat ban » luat ban, xuat san, thuat ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
xua ban » cua ban, qua ban, mua ban
su tren » su tien, tu tren, cu tren
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((mang may) or (nang cao)) hoi. thien van nam ((xua ban) OR (xuat ban)) hanh vi su tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((mang may) OR (nang cao)) hoi. thien van nam ((xua ban) OR (xuat ban)) hanh vi su tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((mang may) or (nang cao)) hoi. thien van nam ((xua ban) OR (xuat ban)) hanh vi su tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((mang may) or (nang cao)) hoi. thien van nam ((xua ban) OR (xuat ban)) hanh vi su tren*.