Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cua tuc » cua duc, cua tu, cua thuoc
va dan » ca dan, va dao, va dau
ve cam » ve cham, ve cac, va cam
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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 ky nang ((o hoi) or (o hai)). hieu ve cam xuc ((va dan) or (va dinh)) vai cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (o hai)). hieu ve cam xuc ((va dan) OR (va dinh)) vai cua tuc.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (o hai)). hieu ve cam xuc ((va dan) or (va dinh)) vai cua tuc*.