Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
hanh ve » hanh vi, hanh va, hanh kem
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
va cau » van cau, va dau, va cao
ve cua » le cua, de cua, te 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: thu sach o lang ((van loi) or (van hoa)). hieu ((va cau) or (va cac)) thuc dan hanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach o lang ((van loi) OR (van hoa)). hieu ((va cau) OR (va cac)) thuc dan hanh ve cua te.
• Adding a wildcard symbol may retrieve word variants: thu sach o lang ((van loi) or (van hoa)). hieu ((va cau) or (va cac)) thuc dan hanh ve cua te*.