Perhaps you should try some spelling variations:
thien van » thi van
van hanh » van thanh, ban hanh, van anh
tham duc » pham duc, tham du, than duc
van tham » van thanh, van tuan, van chat
luu tre » cuu tre, luy tre
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
tru » truc

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang ma)) hoi. thien van tham duc van hanh vi ((luu tre) OR (luu tru))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (nang ma)) hoi. thien van tham duc van hanh vi ((luu tre) or (luu tru))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) OR (nang ma)) hoi. thien van tham duc van hanh vi ((luu tre) or (luu tru))*.