Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
cac xuc » cam xuc, chat xuc, cac cuoc
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky lang xa hoi. hieu vien ((cac xuc) OR (cac nuoc)) ((va hanh) or (gia thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky lang xa hoi. hieu vien ((cac xuc) OR (cac nuoc)) ((va hanh) OR (gia thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky lang xa hoi. hieu vien ((cac xuc) OR (cac nuoc)) ((va hanh) or (gia thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky lang xa hoi. hieu vien ((cac xuc) OR (cac nuoc)) ((va hanh) or (gia thanh)) vi cua tre*.