Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, thieu nien, hieu tieng
van hanh » van thanh, ban hanh, van anh
sach thi » sach thu, sach tai, sach thieu
thi hanh » thi thanh
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
hanh xa » hanh va, hanh ma, hanh xu
tu sach » thu sach, su sach, te sach
lam va » nam va, dam va, am va
lam ha » nam ha, dam ha, lam chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thi hanh xa hoi. ((hieu vien) OR (hieu viec)) cac luc van hanh ((lam va) or (lam ha)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hanh xa hoi. ((hieu vien) OR (hieu viec)) cac luc van hanh ((lam va) OR (lam ha)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi hanh xa hoi. ((hieu vien) OR (hieu viec)) cac luc van hanh ((lam va) or (lam ha)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi hanh xa hoi. ((hieu vien) OR (hieu viec)) cac luc van hanh ((lam va) or (lam ha)) triet*.