Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
cam duc » cam xuc, cao duc, nam duoc
vai cua » dai cua, hai cua, lai cua
ang xa » lang xa, mang xa, dang xay
ty ang » ty xang, ty hang, ty anh

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) or (toc sach)) ty ang xa hoi. hieu van ((cam duc) OR (pham duc)) ban hanh vai cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty ang xa hoi. hieu van ((cam duc) OR (pham duc)) ban hanh vai cua thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty ang xa hoi. hieu van ((cam duc) OR (pham duc)) ban hanh vai cua thuoc".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty ang xa hoi. hieu van ((cam duc) OR (pham duc)) ban hanh vai cua thuoc*.