Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cam » vien cac, vien cao, vien nam
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
cua te » cua tu

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