Perhaps you should try some spelling variations:
hay lang » ha lang, tay lang, nhan lang
hanh vai » hanh vi, hanh va, hanh tai
sach hay » sach han, sach ha, sach nay
thuc dan » thuc hanh, hoc dan, thuc vat
so sach » so sanh, bo sach, co sach
thuc va » thuc vat, thuc day
vai cua » dai cua, hai cua, lai cua
phuc va » phuc vu, chuc va, thuc vat
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
ve cac » va cac, vien cac
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: so sach hay lang xa hoi. hieu ve cac ((phuc va) or (((thuc va) OR (thuc dan)))) hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hay lang xa hoi. hieu ve cac ((phuc va) OR (((thuc va) OR (thuc dan)))) hanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach hay lang xa hoi. hieu ve cac ((phuc va) or (((thuc va) OR (thuc dan)))) hanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach hay lang xa hoi. hieu ve cac ((phuc va) or (((thuc va) OR (thuc dan)))) hanh vai cua te*.