Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
hieu vien » hieu hien, thieu nien, hieu tieng
sach tay » xach tay, sach hay, sach nay
tay lang » tai lang, tay tang, tay quang
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
cac loc » cac lop, cac toc, cac hoc
cua tu » cua tuc, cua su, cua cu

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 tay lang xa hoi. ((hieu vien) or (hieu viec)) cac loc ((va tinh) OR (may tinh)) dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tay lang xa hoi. ((hieu vien) OR (hieu viec)) cac loc ((va tinh) OR (may tinh)) dai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach tay lang xa hoi. ((hieu vien) or (hieu viec)) cac loc ((va tinh) OR (may tinh)) dai cua tu".
• Adding a wildcard symbol may retrieve word variants: tu sach tay lang xa hoi. ((hieu vien) or (hieu viec)) cac loc ((va tinh) OR (may tinh)) dai cua tu*.