Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
nam thuoc » nam thuc, nha thuoc, cay thuoc
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
cao hoi » cau hoi, co hoi, cao hoc
van cua » vang cua, ban cua, dan cua
sac ky » cac ky, sai ky
cua te » cua tu

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

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