Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac
nang cho » nang chon, ngang cho, nang cao
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
hoc anh » hoc nganh, hoc nhanh, ngoc anh
cho hoc » co hoc, khoa hoc
luu tre » luu tru, cuu tre, luy tre
v nang » va nang, vu nang, van nang
va cam » va cham, va cac, va cao
tuc va » truc va, tuc xa, duc va
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) OR (hoc anh)) v nang cho hoc. hieu va cam ((tuc va) or (thuc va)) hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc anh)) v nang cho hoc. hieu va cam ((tuc va) OR (thuc va)) hanh vi luu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc anh)) v nang cho hoc. hieu va cam ((tuc va) or (thuc va)) hanh vi luu tre*".