Perhaps you should try some spelling variations:
sach tham » sach nha
nam thuc » nam thuoc, am thuc, nam thu
thai cua » than cua, tai cuc, tri cua
sach kha » sach nha, sach ha, bach khoa
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
di cua » dai cua, doi cua, de cua
ve nam » he nam, va nam, le nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((sach kha) OR (sach tham)) nang xa hoi. hieu ve nam thuc va hanh ((di cua) or (thai cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach kha) OR (sach tham)) nang xa hoi. hieu ve nam thuc va hanh ((di cua) OR (thai cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach kha) OR (sach tham)) nang xa hoi. hieu ve nam thuc va hanh ((di cua) or (thai cua)) triet".
• Adding a wildcard symbol may retrieve word variants: vu ((sach kha) OR (sach tham)) nang xa hoi. hieu ve nam thuc va hanh ((di cua) or (thai cua)) triet*.