Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
nham thuc » nam thuc, nham thu, pham thuc
toc sach » hoc sach, doc sach, thuoc sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
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 tu nang xa hoi. lieu va ((nham thuc) OR (nhan thuc)) va danh ((di cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang xa hoi. lieu va ((nham thuc) OR (nhan thuc)) va danh ((di cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu nang xa hoi. lieu va ((nham thuc) OR (nhan thuc)) va danh ((di cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang xa hoi. lieu va ((nham thuc) OR (nhan thuc)) va danh ((di cua) or (dai cua)) tre*.