Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
truc va » thuc va, thuc vat, trung va
tai cua » thai cua, tai cuc, tri cua
hieu va » lieu va, hieu qua
sach ky » sac ky, sach ty, sach kem
va cam » va cham, va cac, va cao
cua te » cua tu
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: vu ((sach ky) OR (sach y)) nang x hoi. hieu va cam ((truc va) or (thuc dan)) dung tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((sach ky) OR (sach y)) nang x hoi. hieu va cam ((truc va) OR (thuc dan)) dung tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((sach ky) OR (sach y)) nang x hoi. hieu va cam ((truc va) or (thuc dan)) dung tai cua te".
• Adding a wildcard symbol may retrieve word variants: vu ((sach ky) OR (sach y)) nang x hoi. hieu va cam ((truc va) or (thuc dan)) dung tai cua te*.