Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
thanh va » thanh van, hanh va, thanh ha
thanh vi » hanh vi, thanh ve, nhanh vi
cam thuc » am thuc, nam thuc, cam thu
thu sach » tu sach, thuat sach, thuoc sach
va triet » va thiet, va trien, ve triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, 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: ((toc sach) or (thu sach)) ky nang xa hoi. hieu va cam thuc dan ((thanh vi) OR (thanh va)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thu sach)) ky nang xa hoi. hieu va cam thuc dan ((thanh vi) OR (thanh va)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (thu sach)) ky nang xa hoi. hieu va cam thuc dan ((thanh vi) OR (thanh va)) va triet".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thu sach)) ky nang xa hoi. hieu va cam thuc dan ((thanh vi) OR (thanh va)) va triet*.