Perhaps you should try some spelling variations:
dua tren » dung tren
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
thuc xay » thuc day, tuc xay, thuat xay
tu sach » thu sach, su sach, te sach
cuu tre » cua tre, cau tren, cau treo
sach ly » sach y, sach lo, sach ty
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
ma hoi » mai hoi, xa hoi, ma hoa

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 ly nang ma hoi. hieu van nam ((thuc xay) or (thuc vat)) hanh tai ((dua tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly nang ma hoi. hieu van nam ((thuc xay) OR (thuc vat)) hanh tai ((dua tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: tu sach ly nang ma hoi. hieu van nam ((thuc xay) or (thuc vat)) hanh tai ((dua tren) or (cuu tre))*.