Perhaps you should try some spelling variations:
va cham » va chat, va tham
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
sach ky » sach y, sach ty, sach kem
vi cua » vai cua, di cua
dan vi » doan vi, don vi, dan va
va dan » ca dan, va dao, va dau
ve cai » va cai, ve cac, ve tai
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky
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: tu ((sach ky) or (sac ky)) nang ma hoi. hieu ((ve cai) or (va cham)) thuc va dan vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang ma hoi. hieu ((ve cai) OR (va cham)) thuc va dan vi cua tu.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang ma hoi. hieu ((ve cai) or (va cham)) thuc va dan vi cua tu*.