Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dao, sach dung
hieu viec » nhieu viec, hieu ve, sieu viet
hieu van » hieu va, thien van, lieu va
danh doi » danh di, thanh doi, dung doi
nang ma » tang ma, sang ma, nang cao
duoc va » nuoc va, duc va, duoc ma
va danh » va dinh, va dan, va hanh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac
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: su sac ky nang ma hoi. ((hieu viec) or (hieu van)) sach duoc va danh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang ma hoi. ((hieu viec) OR (hieu van)) sach duoc va danh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: su sac ky nang ma hoi. ((hieu viec) or (hieu van)) sach duoc va danh doi cua tre*.