Perhaps you should try some spelling variations:
thien van » thi van
nha thuoc » nha nuoc, nhan thuc, nha hoc
hieu van » hieu va, lieu va, hieu ve
thuoc na » thuoc ma, thuoc va, thuoc la
tu sach » thu sach, su sach, tu cach
te sach » toc sach
na hanh » nha hanh, dna hanh, va hanh
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu
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: ((tu sach) or (te sach)) ky nang x hoi. ((hieu van) or (thien van)) nha thuoc na hanh vi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang x hoi. ((hieu van) OR (thien van)) nha thuoc na hanh vi cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang x hoi. ((hieu van) or (thien van)) nha thuoc na hanh vi cuu tre*.