Perhaps you should try some spelling variations:
trinh van » trinh han, trinh quan, trinh toan
tinh van » dinh van, tinh va, tich van
tu sach » thu sach, su sach, te sach
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
cam loc » cam lo
y sang » _ sang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa
loc va » hoc va, luc 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 y sang ma hoi. ((hieu ve) or (hieu qua)) cam loc va ((tinh van) OR (trinh van)) cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y sang ma hoi. ((hieu ve) OR (hieu qua)) cam loc va ((tinh van) OR (trinh van)) cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y sang ma hoi. ((hieu ve) or (hieu qua)) cam loc va ((tinh van) OR (trinh van)) cua vat".
• Adding a wildcard symbol may retrieve word variants: tu sach y sang ma hoi. ((hieu ve) or (hieu qua)) cam loc va ((tinh van) OR (trinh van)) cua vat*.