Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
nam thuc » nam thuoc, am thuc, nam thu
va thanh » gia thanh, va tinh, le thanh
vu sach » vu bach, su sach, vu khach
nang xa » lang xa, nang ma, mang xa
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
di cua » dai cua, doi cua, de cua
ve nam » he nam, va nam, le nam
cua tu » cua tuc, cua su, cua cu

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 ky ((nang xa) or (nang x)) hoi. hieu ve nam thuc ((va thanh) OR (ban thanh)) di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (nang x)) hoi. hieu ve nam thuc ((va thanh) OR (ban thanh)) di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((nang xa) or (nang x)) hoi. hieu ve nam thuc ((va thanh) OR (ban thanh)) di cua tu".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang xa) or (nang x)) hoi. hieu ve nam thuc ((va thanh) OR (ban thanh)) di cua tu*.