Perhaps you should try some spelling variations:
thien van » thi van
chet duoc » che duoc, cho duoc, che quoc
van hanh » van thanh, ban hanh, van anh
chat duc » chat xuc, chat doc, pham duc
sach ky » sac ky, sach y, sach kem
nang ma » tang ma, sang ma, nang cao
sach ty » sach y, sach tu, sach thu
luu tre » luu tru, cuu tre, luy tre
ma hoi » mai hoi, xa hoi, ma hoa
vi luu » vi lua

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) OR (sach ty)) nang ma hoi. thien van ((chat duc) OR (chet duoc)) van hanh vi luu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sach ty)) nang ma hoi. thien van ((chat duc) OR (chet duoc)) van hanh vi luu tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach ty)) nang ma hoi. thien van ((chat duc) OR (chet duoc)) van hanh vi luu tre*.