Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, thieu nien, hieu tieng
toc sach » hoc sach, doc sach, thuoc sach
tu tieng » luc tieng, tu tuong, tu trong
cac dac » cac dan, cac dai, cac bac
dac van » cac van, dao van, dam van
van anh » van thanh, tuan anh, van minh
v nang » va nang, vu nang, van nang
anh vi » hanh vi, anh va, anh ve
x hoi » xa hoi, o hoi, x ho
vi tu » vi tut, voi tu, va tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((v nang) or (cam nang)) x hoi. ((hieu vien) OR (hieu viec)) cac dac van anh vi tu tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((v nang) OR (cam nang)) x hoi. ((hieu vien) OR (hieu viec)) cac dac van anh vi tu tieng*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((v nang) or (cam nang)) x hoi. ((hieu vien) OR (hieu viec)) cac dac van anh vi tu tieng*".