Perhaps you should try some spelling variations:
va doanh » van doanh, vay doanh, hoa doanh
co thuc » do thuc, co thua, mo thuc
van cua » vang cua, ban cua, dan cua
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
sach tu » sach thu, sach ty, sach uu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
cach tu » cach thuc
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach tu) or (cach tu)) nang xa hoi. hieu va co thuc ((va doanh) OR (va danh)) van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (cach tu)) nang xa hoi. hieu va co thuc ((va doanh) OR (va danh)) van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tu) or (cach tu)) nang xa hoi. hieu va co thuc ((va doanh) OR (va danh)) van cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) or (cach tu)) nang xa hoi. hieu va co thuc ((va doanh) OR (va danh)) van cua tre*.