Perhaps you should try some spelling variations:
van nang » van quang, van dong, van dung
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
tu sach » thu sach, su sach, te sach
ve cai » va cai, ve cac, ve tai
vi cua » vai cua, di cua
cua te » cua tu
va co » vo co

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 ((van nang) or (van ban)) xa hoi. hieu ((ve cai) or (va co)) thuc day hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((van nang) OR (van ban)) xa hoi. hieu ((ve cai) OR (va co)) thuc day hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu sach ((van nang) or (van ban)) xa hoi. hieu ((ve cai) or (va co)) thuc day hanh vi cua te*.