Perhaps you should try some spelling variations:
thien van » thi van
mau chan » mau han, cau chan, mau phan
dau chan » dan chan, cau chan, sau chan
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
van cac » van hac, van cau, van bac
sach ky » sach y, sach ty, sach kem
sac ky » cac ky, sai ky
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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: thuat ((sach ky) OR (sac ky)) nang x hoi. thien van cac nuoc va ((dau chan) OR (mau chan)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat ((sach ky) or (sac ky)) nang x hoi. thien van cac nuoc va ((dau chan) OR (mau chan)) cua te~".
• Adding a wildcard symbol may retrieve word variants: thuat ((sach ky) or (sac ky)) nang x hoi. thien van cac nuoc va ((dau chan) OR (mau chan)) cua te*.