Perhaps you should try some spelling variations:
dinh cuu » dinh chi
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
tuc van » thuc van, truc van, tuc va
dau tuc » dau tu, dao tuc, cau truc
sach ty » sach y, sach tu, sach thu
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
di cuu » di cau, di cua
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 (nang ma)) hoi. lieu va dau tuc van hanh ((di cuu) OR (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang xa) OR (nang ma)) hoi. lieu va dau tuc van hanh ((di cuu) OR (dinh cuu)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((nang xa) or (nang ma)) hoi. lieu va dau tuc van hanh ((di cuu) OR (dinh cuu)) tre*".