Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
toc sach » hoc sach, doc sach, thuoc sach
ty nang » ty xang, ty hang, ly nang
va nham » va cham, va tham, va nha
thuc va » thuc vat, thuc dan, thuc day
va dinh » van dinh, va kinh, va tinh
ma hoi » mai hoi, xa hoi, ma hoa
de cua » le cua, te cua, dieu 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) OR (ky nang)) ma hoi. lieu va nham thuc va dinh ((de cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty nang) OR (ky nang)) ma hoi. lieu va nham thuc va dinh ((de cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty nang) OR (ky nang)) ma hoi. lieu va nham thuc va dinh ((de cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty nang) OR (ky nang)) ma hoi. lieu va nham thuc va dinh ((de cua) or (dai cua)) tre*.