Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
cam thue » cam thu, lam thue, nam thue
nang tai » hang tai, tang tai, sang tai
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thue va » thuc va, thuyet va, thuc vat
va nang » van nang, da nang, cam nang
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: ((tu sach) OR (thu sach)) y nang xa hoi. hieu va cam thue va nang tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) y nang xa hoi. hieu va cam thue va nang tai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) y nang xa hoi. hieu va cam thue va nang tai cua tre*.