Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
sach ty » sach y, sach tu, sach thu
vu sach » vu bach, su sach, vu khach
sang ma » tang ma, nang ma, sang tao
ty sang » ty xang, ty hang, duy sang
ve cac » va cac, vien cac
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao
luc va » duc va, tuc va
loc va » hoc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty sang ma hoi. hieu ((ve cac) or (va cam)) ((luc va) OR (loc va)) hanh dai cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty sang ma hoi. hieu ((ve cac) OR (va cam)) ((luc va) OR (loc va)) hanh dai cua vat*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty sang ma hoi. hieu ((ve cac) or (va cam)) ((luc va) OR (loc va)) hanh dai cua vat*".