Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thu huong » thu cong
thanh hai » thanh phan, thanh hoa, thanh san
thi nang » thi cong, ki nang, thi hanh
nam thuc » nam thuoc, am thuc, nam thu
so sach » so sanh, bo sach, co sach
qua nam » quan nam, cua nam, quang nam
hai cua » thai cua, dai cua, hoi 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: so sach ((thi nang) or (thu huong)) xa hoi. hieu qua nam thuc vat thanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((thi nang) OR (thu huong)) xa hoi. hieu qua nam thuc vat thanh hai cua te.
• Adding a wildcard symbol may retrieve word variants: so sach ((thi nang) or (thu huong)) xa hoi. hieu qua nam thuc vat thanh hai cua te*.