Perhaps you should try some spelling variations:
nang han » nang phan, nang hang, nang hanh
hieu van » hieu va, thien van, lieu va
lam duoc » luat duoc, lam thuoc, tao duoc
nam duoc » nam thuoc, da duoc, dat duoc
va thanh » gia thanh, ban thanh, le thanh
cua tre » cua te, cuu tre, cua triet
va tinh » may tinh
han hoi » phan hoi, dan hoi, van hoi
hai cua » thai cua, dai cua, hoi cua
su sac » su sach, su cac, su xac
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: su sac ky nang han hoi. hieu van ((lam duoc) OR (nam duoc)) ((va thanh) or (va tinh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang han hoi. hieu van ((lam duoc) OR (nam duoc)) ((va thanh) OR (va tinh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang han hoi. hieu van ((lam duoc) OR (nam duoc)) ((va thanh) or (va tinh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang han hoi. hieu van ((lam duoc) OR (nam duoc)) ((va thanh) or (va tinh)) hai cua tre*.