Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty sang » ty xang, ty hang, duy sang
sang ma » tang ma, nang ma, sang tao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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 ty sang ma hoi. hieu ve cham ((thuc va) or (tuc xa)) don vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty sang ma hoi. hieu ve cham ((thuc va) OR (tuc xa)) don vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty sang ma hoi. hieu ve cham ((thuc va) or (tuc xa)) don vi cua tre*.