Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
thu sach » tu sach, thuat sach, thuoc sach
viec cac » vien cac, viec cua, viec lam
sai cua » dai cua, hai cua, lai cua
cac lao » ca lao, cac loai, cac giao
su sach » so sach, vu sach
va dan » ca dan, va dao, va dap
va dau » va dao
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: ((thu sach) or (su sach)) ky nang x hoi. hieu viec cac lao ((va dan) OR (va dau)) sai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang x hoi. hieu viec cac lao ((va dan) OR (va dau)) sai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (su sach)) ky nang x hoi. hieu viec cac lao ((va dan) OR (va dau)) sai cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang x hoi. hieu viec cac lao ((va dan) OR (va dau)) sai cua te*.