Perhaps you should try some spelling variations:
bach tuoc » sach duoc, sach nuoc
thanh doi » thanh loi, thanh moi, thanh do
hieu viec » nhieu viec, hieu ve, sieu viet
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
su sach » vu sach
doi cua » dai cua, hoi cua
tuoc va » thuoc va, nuoc va, duoc va
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
so sach » so sanh, bo sach, co sach
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 sach) OR (so sach)) ky nang ma hoi. ((hieu viec) or (hieu van)) bach tuoc va thanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang ma hoi. ((hieu viec) OR (hieu van)) bach tuoc va thanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (so sach)) ky nang ma hoi. ((hieu viec) or (hieu van)) bach tuoc va thanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (so sach)) ky nang ma hoi. ((hieu viec) or (hieu van)) bach tuoc va thanh doi cua tre*.