Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
dua tren » dung tren
tu sach » thu sach, su sach, te sach
sach tu » sach thu, cach tu, sach ty
tu lang » cu lang, tu lanh, xu lang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
thuc xa » thuc xay, tuc xa, thuc va
xa hanh » xa thanh, xa khanh, va hanh
cuu tre » cua tre, cau tren, cau treo

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach tu lang xa hoi. hieu ve pham thuc xa hanh vi ((dua tren) OR (cuu tre))~.
• Adding a wildcard symbol may retrieve word variants: tu sach tu lang xa hoi. hieu ve pham thuc xa hanh vi ((dua tren) or (cuu tre))*.