Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nuoc ban » nuoc san, quoc ban, buoc ban
chau tre » chay tren, chau tho, cho tre
hanh lam » thanh lap, hanh kem, hanh va
ban hanh » ban hang
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hieu va » lieu va
ca tren » cau tren, cu tren, la tren
y nang » ky nang, ly nang, v nang
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 y nang x hoi. ((hieu va) OR (hieu qua)) cac nuoc ban hanh lam ((chau tre) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang x hoi. ((hieu va) OR (hieu qua)) cac nuoc ban hanh lam ((chau tre) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. ((hieu va) OR (hieu qua)) cac nuoc ban hanh lam ((chau tre) or (ca tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. ((hieu va) OR (hieu qua)) cac nuoc ban hanh lam ((chau tre) or (ca tren))*.