Perhaps you should try some spelling variations:
ve triet » va trien, su triet
sang mai » sang ma, sang tai, lang mai
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
toc sac » toc sach, toc san, hoc sach
hieu va » lieu va
mai hoi » mai khoi, dai hoi, lai hoi
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
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 sang mai hoi. ((hieu va) OR (hieu qua)) cam tuc va hanh vi ((cua te) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sac ky sang mai hoi. ((hieu va) OR (hieu qua)) cam tuc va hanh vi ((cua te) OR (ve triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sac ky sang mai hoi. ((hieu va) OR (hieu qua)) cam tuc va hanh vi ((cua te) or (ve triet))*".