Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
luoc can » hoc can, luoc dai, duoc cac
minh vi » minh voi, dinh vi, minh va
van cau » van dau, van hau, van chat
sach ky » sach y, sach ty, sach kem
sac ky » cac ky, sai ky
vi cua » vai cua, di cua
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) OR (sac ky)) nang x hoi. hieu van cau ((luoc can) or (luc canh)) minh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sac ky)) nang x hoi. hieu van cau ((luoc can) OR (luc canh)) minh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) OR (sac ky)) nang x hoi. hieu van cau ((luoc can) or (luc canh)) minh vi cua te".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) OR (sac ky)) nang x hoi. hieu van cau ((luoc can) or (luc canh)) minh vi cua te*.