Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
sach tham » sach nha
dau truc » cau truc, dai truc, doan truc
vu sach » vu bach, su sach, vu khach
xang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
va dau » va dao
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: vu sach tham ((xang xa) or (mang may)) hoi. hieu va dau truc ((va hanh) or (van thanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach tham ((xang xa) OR (mang may)) hoi. hieu va dau truc ((va hanh) OR (van thanh)) vi cua te.
• Adding a wildcard symbol may retrieve word variants: vu sach tham ((xang xa) or (mang may)) hoi. hieu va dau truc ((va hanh) or (van thanh)) vi cua te*.