Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cam thue » cam thu, lam thue, nam thue
nang tai » hang tai, tang tai, sang tai
hieu va » lieu va, hieu qua
thue va » thuc va, thuyet va, thuc vat
va nang » van nang, da nang, cam nang
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
cuc te » cua te, cuc thue, cuc tieu
5 hoi » o hoi

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 y nang ((5 hoi) or (xa hoi)). hieu va cam thue va nang tai cuc te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((5 hoi) OR (xa hoi)). hieu va cam thue va nang tai cuc te.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((5 hoi) or (xa hoi)). hieu va cam thue va nang tai cuc te*.