Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
va thanh » gia thanh, ban thanh, va tinh
nay thuc » nam thuc, cay thuc, day thuc
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
tai dau » tac dau, tai du, tri dau
thi dau » thi dai, phi dau, thi dan
tu sach » thu sach, su sach, te sach
va nay » va ngay, va cay
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat sach)) ky nang x hoi. hieu va nay thuc va thanh ((tai dau) OR (thi dau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang x hoi. hieu va nay thuc va thanh ((tai dau) OR (thi dau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky nang x hoi. hieu va nay thuc va thanh ((tai dau) OR (thi dau)) tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang x hoi. hieu va nay thuc va thanh ((tai dau) OR (thi dau)) tren*.