Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
thien van » thi van
va trinh » van trinh, va tinh, lap trinh
nam thuc » nam thuoc, am thuc, nam thu
vat cua » mat cua, bat cua, dat cua
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach thu, xach tay
nang xa » lang xa, nang ma, mang xa
sach tu » sach thu, cach tu, sach uu

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) OR (sach tu)) ((nang xa) or (nang x)) hoi. thien van nam thuc va trinh vat cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) ((nang xa) OR (nang x)) hoi. thien van nam thuc va trinh vat cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) ((nang xa) or (nang x)) hoi. thien van nam thuc va trinh vat cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach tu)) ((nang xa) or (nang x)) hoi. thien van nam thuc va trinh vat cua tre*.