Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
lang van » dang van, tang van, hoang van
thuoc va » thuc va, thuoc ma, thuong va
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
va dan » ca dan, va dao, va dau
va nam » van nam, ha nam, va nay

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) OR (hoc sach)) ky lang van hoi. hieu va nam thuoc va dan ((vai cuu) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky lang van hoi. hieu va nam thuoc va dan ((vai cuu) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ky lang van hoi. hieu va nam thuoc va dan ((vai cuu) or (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ky lang van hoi. hieu va nam thuoc va dan ((vai cuu) or (vai cua)) tre*.