Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam thuc » nam thuoc, am thuc, nam thu
hanh tai » thanh tai, hang tai, han tai
nang mai » nang ma, nang tai, lang mai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
tai cua » thai cua, tai cuc, tri cua
nam tuc » nam truc, nam tu, nam thuoc
mai hoi » mai khoi, dai hoi, lai hoi
cua tu » cua tuc, cua su, cua cu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (dac sac)) ky nang mai hoi. hieu van ((nam tuc) or (nam thuc)) van hanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (dac sac)) ky nang mai hoi. hieu van ((nam tuc) OR (nam thuc)) van hanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (dac sac)) ky nang mai hoi. hieu van ((nam tuc) or (nam thuc)) van hanh tai cua tu*.