Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
thanh tai » thanh hai, thanh toan, doanh tai
viec cac » vien cac, viec cua, viec lam
hanh tai » hang tai, han tai, hinh tai
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
cuc tre » duc tre, cua tre, cuu tre
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sach y)) nang o hoi. hieu viec cac duc van ((hanh tai) OR (thanh tai)) cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach y)) nang o hoi. hieu viec cac duc van ((hanh tai) OR (thanh tai)) cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sach y)) nang o hoi. hieu viec cac duc van ((hanh tai) OR (thanh tai)) cuc tre".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) or (sach y)) nang o hoi. hieu viec cac duc van ((hanh tai) OR (thanh tai)) cuc tre*.