Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
tang hanh » tang thanh, dang hanh, nang hanh
hanh tai » thanh tai, hang tai, han tai
cac tuc » cac toc, cac tu, cac nuoc
tai cua » thai cua, tai cuc, tri cua
cac tac » cac toc, cac bac, cac dac
toc sac » toc sach, toc san, hoc sach
ky dung » ly dung, ky dang, ky vung
sac ky » cac ky, sai ky
ha hoi » hoa hoi, ha noi, va hoi
cua te » cua 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 sac ky dung ((ha hoi) or (xa hoi)). hieu viec ((cac tuc) OR (cac tac)) tang hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky dung ((ha hoi) OR (xa hoi)). hieu viec ((cac tuc) OR (cac tac)) tang hanh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky dung ((ha hoi) or (xa hoi)). hieu viec ((cac tuc) OR (cac tac)) tang hanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sac ky dung ((ha hoi) or (xa hoi)). hieu viec ((cac tuc) OR (cac tac)) tang hanh tai cua te*.