Perhaps you should try some spelling variations:
thach thuc » thuc thuc, thanh thuy, cach thuc
nham thuc » nhan thuc, nam thuc, nham thu
pham chuc » pham duc, pham huu, kham chua
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma 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 sac ky nang ma hoi. hieu van ((thach thuc) or (((pham chuc) or (nham thuc)))) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoi. hieu van ((thach thuc) OR (((pham chuc) OR (nham thuc)))) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu van ((thach thuc) or (((pham chuc) or (nham thuc)))) va hanh vi cua tre*.