Perhaps you should try some spelling variations:
hieu vien » hieu hien, thieu nien, hieu tieng
hieu viec » nhieu viec, hieu ve, sieu viet
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
bach xuc » bach tuoc, bach xuan, bach hue
tu sach » thu sach, su sach, te sach
chu tre » cho tre, chu tri, cuu tre
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
tang xa » trang xa, tang ma, tang ha
xuc va » duc va, tuc va, luc va
va chu » va che, va cau, va chi

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

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