Perhaps you should try some spelling variations:
vien cac » vien bach, vien dai, vien da
sach hay » sach han, sach ha, sach nay
hay lang » ha lang, tay lang, nhan lang
thuc va » thuc vat, thuc dan, thuc day
phuc va » phuc vu, chuc va, thuc vat
co sach » bo sach, cuon sach, hoc sach
lang xa » lang ha, dang xay, lang van
ve cac » va cac
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach hay lang xa hoi. hieu ((ve cac) OR (vien cac)) ((phuc va) or (thuc va)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach hay lang xa hoi. hieu ((ve cac) OR (vien cac)) ((phuc va) OR (thuc va)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach hay lang xa hoi. hieu ((ve cac) OR (vien cac)) ((phuc va) or (thuc va)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: co sach hay lang xa hoi. hieu ((ve cac) OR (vien cac)) ((phuc va) or (thuc va)) hanh vi cua te*.