Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
nang xa » nang x, nang ma, mang xa
hoi cua » hoi chuc
doi cua » dai cua
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach tu, sach thu
dau tuc » dau tu, dao tuc, cau truc
tuc van » thuc van, truc van, tuc va
va dau » va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang xa) OR (lang xa)) hoi. lieu va dau tuc van hanh ((doi cua) or (hoi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (lang xa)) hoi. lieu va dau tuc van hanh ((doi cua) OR (hoi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) OR (lang xa)) hoi. lieu va dau tuc van hanh ((doi cua) or (hoi cua)) te".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang xa) OR (lang xa)) hoi. lieu va dau tuc van hanh ((doi cua) or (hoi cua)) te*.