Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
thu sach » tu sach, thuat sach, thuoc sach
danh sai » dung sai, danh bat, danh dau
sai cua » dai cua, hai cua, lai cua
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
da lao » da bao, da lam, da lat
lao va » tao va, cao va, bao 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: ((thu sach) or (su sach)) ky nang x hoi. ((hieu vien) OR (thieu nien)) da lao va danh 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 vien) OR (thieu nien)) da lao va danh 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 vien) OR (thieu nien)) da lao va danh sai cua te".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang x hoi. ((hieu vien) OR (thieu nien)) da lao va danh sai cua te*.