Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thanh tai » thanh hai, thanh toan, doanh tai
ve triet » va trien, su triet
va thanh » gia thanh, ban thanh, va tinh
tang van » dang van, hoang van, trong van
su viet » so viet
thuc va » thuc vat, thuc dan, thuc day
va tham » van tham, va cham, va thuat
hieu va » lieu va, hieu qua
tang ma » mang may
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((tang ma) or (tang van)) hoi. hieu va tham thuc va thanh tai ((ve triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((tang ma) OR (tang van)) hoi. hieu va tham thuc va thanh tai ((ve triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((tang ma) or (tang van)) hoi. hieu va tham thuc va thanh tai ((ve triet) or (su viet))*.