Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, lieu va
sach kem » hanh kem
thuc cua » hoc cua, thuc va
van pham » san pham, van phan, van phat
ban cua » ban quan
can ban » van ban, toan ban
cua can » cua cac, cua ban, cua dan
sach ky » sac ky, sach ty, sach hay
dang xa » dang xay, lang xa, dang ha
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((((sach ky) or (sach kem))) or (sach y)) dang xa hoi. hieu van pham thuc cua can ban cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((((sach ky) OR (sach kem))) OR (sach y)) dang xa hoi. hieu van pham thuc cua can ban cua tu.
• Adding a wildcard symbol may retrieve word variants: su ((((sach ky) or (sach kem))) or (sach y)) dang xa hoi. hieu van pham thuc cua can ban cua tu*.