Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
duoc va » nuoc va, duoc ma, duong va
kinh vi » dinh vi, kinh ve, kenh vi
luu tre » luu tru, cuu tre, luy tre
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ky nang xa hoi. ((hieu van) or (thien van)) lam ((duoc va) or (duc va)) kinh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang xa hoi. ((hieu van) OR (thien van)) lam ((duoc va) OR (duc va)) kinh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky nang xa hoi. ((hieu van) or (thien van)) lam ((duoc va) or (duc va)) kinh vi luu tre*.