Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, pham thuc
toc sach » hoc sach, doc sach, thuoc sach
nham thu » nam thu, pham thu, nhan thuc
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
di cua » doi cua, de cua, do cua

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 ty nang xa hoi. lieu va ((nham thuc) OR (nham thu)) va danh ((di cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang xa hoi. lieu va ((nham thuc) OR (nham thu)) va danh ((di cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty nang xa hoi. lieu va ((nham thuc) OR (nham thu)) va danh ((di cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang xa hoi. lieu va ((nham thuc) OR (nham thu)) va danh ((di cua) or (dai cua)) tre*.