Perhaps you should try some spelling variations:
toc cach » hoc cach, toc sach, truoc cach
vinh cuu » dinh cuu, sinh cua, dinh cu
cach tu » cach thuc
tu nang » tru nang, tu nong, tu nano
hieu va » lieu va, hieu qua
thuc va » thuc dan, thuc day
va cao » va cac, va co, va dao
vi cuu » vi luu
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc cach tu nang x hoi. hieu va cao ((thuc va) or (thuc vat)) hanh ((vi cuu) OR (vinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc cach tu nang x hoi. hieu va cao ((thuc va) OR (thuc vat)) hanh ((vi cuu) OR (vinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc cach tu nang x hoi. hieu va cao ((thuc va) or (thuc vat)) hanh ((vi cuu) OR (vinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: toc cach tu nang x hoi. hieu va cao ((thuc va) or (thuc vat)) hanh ((vi cuu) OR (vinh cuu)) tre*.