Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hanh hai » thanh hai, nhanh hai, hang hai
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
tu sach » su sach, te sach, tu cach
dang xa » dang xay, lang xa, dang va
dang ha » dong ha, dung ha, lang ha
cac tu » cac thu, cach tu, cac du
tu van » tu va
hai va » hai van, thai va, hoi va

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) or (thu sach)) ky ((dang xa) OR (dang ha)) hoi. hieu va cac tu van hanh hai va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky ((dang xa) OR (dang ha)) hoi. hieu va cac tu van hanh hai va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky ((dang xa) OR (dang ha)) hoi. hieu va cac tu van hanh hai va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky ((dang xa) OR (dang ha)) hoi. hieu va cac tu van hanh hai va triet*.