Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
hanh dai » hanh tai, hanh dao, vanh dai
cham duc » pham duc, cham soc, pham duy
cua viet » ca viet, hoa viet, cua vat
hoc sach » hoc sinh, hoc cac, hoc anh
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
va hanh » van hanh, va thanh, va danh
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (hoc sach)) ty nang ((ma hoi) or (xa hoi)). hieu ve cham duc va hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (hoc sach)) ty nang ((ma hoi) OR (xa hoi)). hieu ve cham duc va hanh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc sach)) ty nang ((ma hoi) or (xa hoi)). hieu ve cham duc va hanh dai cua viet*.