Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
cua tuc » cua duc, cua tu, luat tuc
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
te sach » toc sach
lang xa » lang ha, dang xay, lang van
sach o » sach lo, sac o, sach y
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai
o lang » hoa lang, hoi lang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach o lang xa hoi. hieu ((ve cam) OR (va cam)) truc va hanh vi ((cua tuc) OR (cua thuoc))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach o lang xa hoi. hieu ((ve cam) OR (va cam)) truc va hanh vi ((cua tuc) or (cua thuoc))~".
• Adding a wildcard symbol may retrieve word variants: te sach o lang xa hoi. hieu ((ve cam) OR (va cam)) truc va hanh vi ((cua tuc) or (cua thuoc))*.