Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
viec cac » vien cac, viec cua, viec lam
san hanh » san thanh, ban hanh, van hanh
sach ky » sach y, sach ty, sach kem
cac toc » cac toi, cac nuoc, cac thoi
sac ky » cac ky, sai ky
x hoi » xa hoi, o hoi, x ho
ve ve » va ve, ke ve, ve ke

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sac ky)) nang x hoi. hieu viec cac toc san hanh ((ve ve) or (de ve)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang x hoi. hieu viec cac toc san hanh ((ve ve) OR (de ve)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang x hoi. hieu viec cac toc san hanh ((ve ve) or (de ve)) triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) nang x hoi. hieu viec cac toc san hanh ((ve ve) or (de ve)) triet*.