Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
cau tren » cu tren, dau tren, ca tren
toc sac » toc sach, toc san, hoc sach
dan vai » dan va, dan tai, dan vat
cua tre » cua te, cuu tre, cua triet
thuc va » thuc vat, thuc day
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
va nay » va ngay, va cay

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky lang xa hoi. hieu va nay ((thuc va) or (thuc dan)) dan vai ((cau tren) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky lang xa hoi. hieu va nay ((thuc va) OR (thuc dan)) dan vai ((cau tren) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: toc sac ky lang xa hoi. hieu va nay ((thuc va) or (thuc dan)) dan vai ((cau tren) or (cua tre))*.