Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
sach thu » sach thue, sach thieu, sach tham
hoach xa » hoach xay, hoach va, hoach ha
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
hanh tai » thanh tai, han tai, hinh tai
hang tai » hang va, dung tai
tu sach » thu sach, su sach, te sach
thuc xa » thuc xay, tuc xa, thuc va
cua tre » cua te, cuu tre, cua triet

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 thu hoach xa hoi. hieu van pham thuc xa ((hanh tai) or (hang tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu hoach xa hoi. hieu van pham thuc xa ((hanh tai) OR (hang tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach thu hoach xa hoi. hieu van pham thuc xa ((hanh tai) or (hang tai)) cua tre*.