Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
thanh va » thanh van, hanh va, thanh ha
thanh vi » hanh vi, thanh ve, nhanh vi
cua tre » cua te, cuu tre, cua triet
cao duc » dao duc, cao suc, tao duoc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sac ky nang ma hoi. hieu va ((cao duc) or (giao duc)) va ((thanh vi) OR (thanh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky nang ma hoi. hieu va ((cao duc) OR (giao duc)) va ((thanh vi) OR (thanh va)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sac ky nang ma hoi. hieu va ((cao duc) or (giao duc)) va ((thanh vi) OR (thanh va)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky nang ma hoi. hieu va ((cao duc) or (giao duc)) va ((thanh vi) OR (thanh va)) cua tre*.