Perhaps you should try some spelling variations:
nam trung » nam trong, tai trung, ba trung
van hanh » van thanh, ban hanh, van anh
nam truc » nam truoc, nam thuc, nam thuoc
su sach » so sach, vu sach
sach lo » sach dao, sach doi, sach hoi
cuu tre » cua tre, cau tren, cau treo
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
vi cuu » vi luu, vinh cuu

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 lo ((nang xa) OR (nang ma)) hoi. lieu va ((nam truc) or (nam trung)) van hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach lo ((nang xa) OR (nang ma)) hoi. lieu va ((nam truc) OR (nam trung)) van hanh vi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach lo ((nang xa) OR (nang ma)) hoi. lieu va ((nam truc) or (nam trung)) van hanh vi cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach lo ((nang xa) OR (nang ma)) hoi. lieu va ((nam truc) or (nam trung)) van hanh vi cuu tre*.