Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
cam thuc » am thuc, nam thuc, cam thu
lang mai » lang dai, lang hai, lang man
ve triet » su triet
va hanh » van hanh, va thanh, va danh
toc sac » toc sach, toc san, hoc sach
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ky lang » ky nang, ky dang, ky tang
thuc va » thuc vat, thuc dan, thuc day
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sac ky lang mai hoi. hieu va cam thuc va hanh vi ((cua te) or (((ve triet) OR (va trien))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky lang mai hoi. hieu va cam thuc va hanh vi ((cua te) OR (((ve triet) OR (va trien))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky lang mai hoi. hieu va cam thuc va hanh vi ((cua te) or (((ve triet) OR (va trien))))*".