Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
gian cua » gian xu, ban cua
sach ky » sac ky, sach kem, sach hay
sach ty » sach tu, sach thu, xach tay
dang xa » dang xay, lang xa, dang ha
thuc ca » thuc cua, thuc can, thuc cao
ca dan » cac dan, ca dao
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 ty) OR (sach y)))) dang xa hoi. hieu van pham thuc ca dan gian cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (((sach ty) OR (sach y)))) dang xa hoi. hieu van pham thuc ca dan gian cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (((sach ty) OR (sach y)))) dang xa hoi. hieu van pham thuc ca dan gian cua tu".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (((sach ty) OR (sach y)))) dang xa hoi. hieu van pham thuc ca dan gian cua tu*.