Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nam thuc » nam thuoc, am thuc, nam thu
van cau » van dau, van hau, van chat
sach ty » sach y, sach tu, sach thu
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
ve nam » he nam, va nam, le nam
va cuu » va chu, va huu
va cau » va cac, va dau, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang xa hoi. hieu ve nam thuc va hanh ((va cuu) or (((va cau) or (van cau)))) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang xa hoi. hieu ve nam thuc va hanh ((va cuu) OR (((va cau) OR (van cau)))) tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang xa hoi. hieu ve nam thuc va hanh ((va cuu) or (((va cau) or (van cau)))) tre*.