Perhaps you should try some spelling variations:
thuat thuc » thuat thuy, thuyet thuc, thuc thuc
va thuat » ky thuat, ki thuat, va thuc
dong cua » dung cua, cong cua, huong cua
sach thu » sach thue, sach thieu, sach tham
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
sach ty » sach y, sach tu, xach tay
hieu va » lieu va, hieu qua
xang xa » lang xa, mang xa, ang xa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ty) or (sach thu)) xang xa hoi. hieu va thuat thuc ((va danh) OR (va hanh)) dong cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach thu)) xang xa hoi. hieu va thuat thuc ((va danh) OR (va hanh)) dong cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach thu)) xang xa hoi. hieu va thuat thuc ((va danh) OR (va hanh)) dong cua te".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach thu)) xang xa hoi. hieu va thuat thuc ((va danh) OR (va hanh)) dong cua te*.