Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
cua viet » ca viet, hoa viet, cua vat
hieu van » hieu va, thien van, lieu va
danh vai » danh sai, danh va, doanh van
lam duoc » nam duoc, luat duoc, tao duoc
ky danh » ky anh, ky dang
ma danh » va danh, ma dan, mo danh
ky lang » ky nang, ky dang, ky tang
vai cua » dai cua, hai cua, lai cua
te sach » toc sach

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 ((ky lang) or (ky danh)) xa hoi. hieu van ((lam duoc) or (lam thuoc)) ma danh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky lang) OR (ky danh)) xa hoi. hieu van ((lam duoc) OR (lam thuoc)) ma danh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) or (ky danh)) xa hoi. hieu van ((lam duoc) or (lam thuoc)) ma danh vai cua viet*.