Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van thanh » ban thanh, van tuan
thanh di » thanh doi, thanh de, thanh do
lang mai » lang dai, lang hai, lang man
ve cham » va cham, ve chat, vu cham
xuc van » duc van, luc van, vuc van
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
y lang » o lang, _ lang, tay lang
di cua » dai cua, doi cua, de cua
ve cam » ve cac, va cam, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuoc sach)) y lang mai hoi. hieu ((ve cam) OR (ve cham)) xuc van thanh di cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) y lang mai hoi. hieu ((ve cam) OR (ve cham)) xuc van thanh di cua thuoc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuoc sach)) y lang mai hoi. hieu ((ve cam) OR (ve cham)) xuc van thanh di cua thuoc".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) y lang mai hoi. hieu ((ve cam) OR (ve cham)) xuc van thanh di cua thuoc*.