Perhaps you should try some spelling variations:
cua triet » su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
lang xa » lang ha, dang xay, lang van
cac luc » cau luc, coc luc, cac nuoc
luc van » luoc van, luu van, duc van
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
2 lang » 22 lang, o lang, _ lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) OR (tu sach)) 2 lang xa hoi. hieu va cac luc van hanh lai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) 2 lang xa hoi. hieu va cac luc van hanh lai ((cua triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) 2 lang xa hoi. hieu va cac luc van hanh lai ((cua triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) 2 lang xa hoi. hieu va cac luc van hanh lai ((cua triet) or (cua viet))*.