Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
van nham » van nam, van nhan, van tham
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (toc sach)) ky nang xa hoi. hieu van nham thuc va hanh ((vai cua) OR (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (toc sach)) ky nang xa hoi. hieu van nham thuc va hanh ((vai cua) OR (lai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (toc sach)) ky nang xa hoi. hieu van nham thuc va hanh ((vai cua) OR (lai cua)) tre*".