Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hanh dao » lanh dao, thanh dat, thanh dam
van hanh » van thanh, ban hanh, van anh
nang co » nang cao, nang doc, nang noi
sach tu » sach thu, cach tu, sach uu
sach ty » sach y, sach thu, xach tay
cac duc » cac du, cao duc, cac nuoc
cac dac » cac dan, cac dai, cac bac
dao cua » dai cua, day cua, dan cua
cua cau » cua cac, cua chu, cua cay

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 ty) OR (sach tu)) nang co hoc. hieu viec ((cac duc) or (cac dac)) van hanh dao cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ty) OR (sach tu)) nang co hoc. hieu viec ((cac duc) OR (cac dac)) van hanh dao cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ty) OR (sach tu)) nang co hoc. hieu viec ((cac duc) or (cac dac)) van hanh dao cua cau*".