Perhaps you should try some spelling variations:
doc thuc » hoc thuc, do thuc, hoc thuoc
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
coc tuc » coc luc, hoc thuc, hoc truc
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
va cua » va chua, via cua, ca cua

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 lang xa hoi. hieu ve ((coc tuc) OR (doc thuc)) va tinh va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky lang xa hoi. hieu ve ((coc tuc) OR (doc thuc)) va tinh va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky lang xa hoi. hieu ve ((coc tuc) OR (doc thuc)) va tinh va cua tre*.