Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
dung tren » dung trong, dung trung
vat hang » van hang, dat hang, va hang
te sach » toc sach
hang vi » hang va, hanh vi, hang di
ve cach » va cach, ve cac, ve canh
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
lang ha » long ha
lang xa » dang xay, lang van
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((lang xa) or (lang ha)) hoi. hieu ve cach thuc vat hang vi ((dung tren) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (lang ha)) hoi. hieu ve cach thuc vat hang vi ((dung tren) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (lang ha)) hoi. hieu ve cach thuc vat hang vi ((dung tren) or (cuu tre))*.