Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
nang doc » nang luc
tap cua » tap quan, tiep cua
lap cua » lai cua, lam cua, ap cua
va phan » van phan, va phat, va phap
thuc va » thuc vat, thuc dan, thuc day
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham

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 ty ((nang doc) or (nang cao)) hoc. hieu vu cham thuc va phan ((lap cua) or (tap cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty ((nang doc) OR (nang cao)) hoc. hieu vu cham thuc va phan ((lap cua) OR (tap cua)) triet.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang doc) or (nang cao)) hoc. hieu vu cham thuc va phan ((lap cua) or (tap cua)) triet*.