Perhaps you should try some spelling variations:
dang thai » dang thi, dang hai, dang khai
thuoc sac » thuoc sach, thuoc dac, thuoc sai
thi hanh » thi thanh
nuoc van » nuoc san, luoc van, nuoc dan
thai cua » than cua, tai cuc, tri cua
thi van » thi lan, thi nang
cua tre » cua te, cuu tre, cua triet
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho

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 x hoi. ((thi van) or (thi hanh)) bac ((nuoc van) OR (nuoc va)) dang thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sac ky nang x hoi. ((thi van) OR (thi hanh)) bac ((nuoc van) OR (nuoc va)) dang thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sac ky nang x hoi. ((thi van) or (thi hanh)) bac ((nuoc van) OR (nuoc va)) dang thai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky nang x hoi. ((thi van) or (thi hanh)) bac ((nuoc van) OR (nuoc va)) dang thai cua tre*.