Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
van thanh » ban thanh, van tuan
thanh di » thanh doi, thanh de, thanh do
thu sach » thuat sach, thuoc sach, thu hoach
nang mai » nang ma, nang tai, lang mai
duc van » duc va, duc tan, duc manh
cao duc » dao duc, cao suc, giao duc
tu sach » su sach, te sach, tu cach
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
di cua » dai cua, doi cua, de cua

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 (thu sach)) y nang mai hoi. ((lieu va) or (hieu qua)) cao duc van thanh di cua thuoc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) y nang mai hoi. ((lieu va) OR (hieu qua)) cao duc van thanh di cua thuoc.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) y nang mai hoi. ((lieu va) or (hieu qua)) cao duc van thanh di cua thuoc*.