Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cua thuoc » nha thuoc, cay thuoc, cua nuoc
doc sach » hoc sach, toc sach, nuoc sach
hieu van » thien van, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
cua tuc » cua duc, cua tu, luat tuc
y hang » ly hang, ty hang, yu hang
va hoa » van hoa, va hoc, ma hoa
xuc va » duc va, tuc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach y hang va hoa. ((hieu van) OR (hieu va)) cac xuc va thanh dai ((cua tuc) or (cua thuoc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach y hang va hoa. ((hieu van) OR (hieu va)) cac xuc va thanh dai ((cua tuc) OR (cua thuoc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach y hang va hoa. ((hieu van) OR (hieu va)) cac xuc va thanh dai ((cua tuc) or (cua thuoc))".
• Adding a wildcard symbol may retrieve word variants: doc sach y hang va hoa. ((hieu van) OR (hieu va)) cac xuc va thanh dai ((cua tuc) or (cua thuoc))*.