Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
thu sach » thuat sach, thuoc sach, thu hoach
viec coc » viec doc, viec cong, viec cuoi
luoc van » luoc can, luoc va, luot van
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » su sach, te sach, tu cach
luc van » luu van, duc van, luc va
cua te » cua tu
x hoi » xa hoi, o hoi, x ho

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) or (thu sach)) ky nang x hoi. hieu viec coc ((luc van) OR (luoc van)) hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang x hoi. hieu viec coc ((luc van) OR (luoc van)) hanh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky nang x hoi. hieu viec coc ((luc van) OR (luoc van)) hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang x hoi. hieu viec coc ((luc van) OR (luoc van)) hanh dai cua te*.