Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
nam thuc » nam thuoc, am thuc, nam thu
danh tai » doanh tai, dinh tai, hanh tai
nam tuc » nam truc, nam tu, nam thuoc
va danh » va dinh, va dan, va hanh
tai cua » thai cua, tai cuc, tri cua
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: ((hoc sach) or (dac sac)) ky nang x hoi. lieu va ((nam tuc) OR (nam thuc)) va danh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (dac sac)) ky nang x hoi. lieu va ((nam tuc) OR (nam thuc)) va danh tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (dac sac)) ky nang x hoi. lieu va ((nam tuc) OR (nam thuc)) va danh tai cua te".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (dac sac)) ky nang x hoi. lieu va ((nam tuc) OR (nam thuc)) va danh tai cua te*.