Perhaps you should try some spelling variations:
ve triet » va trien, su triet
sach thu » sach thue, sach thieu, sach tham
tinh va » tich va, trinh van, trinh vat
va tinh » may tinh
cam loc » cam lo
hieu va » lieu va, hieu qua
su sach » so sach, vu sach
hieu ve » hieu van
sang ma » tang ma, nang ma, sang tao
lang xa » lang ha, dang xay, lang van
loc va » hoc va, luc va
va ve » va de, va le, va vi

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach thu ((lang xa) or (sang ma)) hoi. ((hieu ve) OR (hieu va)) cam loc va tinh va ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu ((lang xa) OR (sang ma)) hoi. ((hieu ve) OR (hieu va)) cam loc va tinh va ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thu ((lang xa) or (sang ma)) hoi. ((hieu ve) OR (hieu va)) cam loc va tinh va ve triet".
• Adding a wildcard symbol may retrieve word variants: su sach thu ((lang xa) or (sang ma)) hoi. ((hieu ve) OR (hieu va)) cam loc va tinh va ve triet*.