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