Perhaps you should try some spelling variations:
thieu nien » thien nhien
nhieu viec » hieu viec, nhien viet
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
sach ky » sac ky, sach y, sach ty
va danh » va dinh, va dan, va hanh
su sach » so sach, vu sach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa
ve cuu » ve cau, ve chu, ve cum
ve cua » le cua, de cua, te 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 sach ky tang ma hoi. ((thieu nien) or (nhieu viec)) cac nuoc va danh ((ve cuu) OR (ve cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ma hoi. ((thieu nien) OR (nhieu viec)) cac nuoc va danh ((ve cuu) OR (ve cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang ma hoi. ((thieu nien) or (nhieu viec)) cac nuoc va danh ((ve cuu) OR (ve cua)) tre*".