Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
kham chua » kham pha
nham thu » nham thuc, nam thu, pham thu
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
ky mang » ky nang, ke mang, ky dang
may hoi » may thoi, tay hoi, mai hoi
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

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 mang may hoi. hieu van ((pham thuc) or (((kham chua) or (nham thu)))) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky mang may hoi. hieu van ((pham thuc) OR (((kham chua) OR (nham thu)))) va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky mang may hoi. hieu van ((pham thuc) or (((kham chua) or (nham thu)))) va hanh vi cua tre*.