Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
luc va » duc va, tuc va, loc va
tu sac » tu sach, tu cac, tu san
va cao » va cac, va co, va dao
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (thuoc sach)) ky nang ma hoi. hieu ((ve cam) or (va cao)) luc va hanh vai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (thuoc sach)) ky nang ma hoi. hieu ((ve cam) OR (va cao)) luc va hanh vai cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (thuoc sach)) ky nang ma hoi. hieu ((ve cam) or (va cao)) luc va hanh vai cua vat*.