Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
toc sach » hoc sach, doc sach, thuoc sach
cac thuc » cach thuc, cac thu, can thuc
dan thuc » dan toc, am thuc
day hanh » day nhanh, day thanh, dao hanh
hanh vai » hanh vi, hanh va, hanh tai
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
cua su » qua su
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: toc sach thieu nang x hoi. hieu va ((cac thuc) or (dan thuc)) day hanh vai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thieu nang x hoi. hieu va ((cac thuc) OR (dan thuc)) day hanh vai cua su.
• Adding a wildcard symbol may retrieve word variants: toc sach thieu nang x hoi. hieu va ((cac thuc) or (dan thuc)) day hanh vai cua su*.