Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di cua

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 (thu sach)) ky nang ma hoa. hieu ((ve cam) or (va cam)) tuc va hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (thu sach)) ky nang ma hoa. hieu ((ve cam) OR (va cam)) tuc va hanh vi cua vat.
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (thu sach)) ky nang ma hoa. hieu ((ve cam) or (va cam)) tuc va hanh vi cua vat*.