Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cau tren » cu tren, dau tren, ca tren
sach kem » hanh kem
dua tren » dung tren
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va pham » van pham, va phat, va phap

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