Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
luoc can » luc canh, hoc can, luoc dai
su triet » su tien, ve triet
hieu va » lieu va, hieu qua
duc van » duc va, duc tan, duc manh
su viet » so viet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang mai khoi. hieu va cac ((duc van) or (luoc can)) hanh vi ((su triet) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang mai khoi. hieu va cac ((duc van) OR (luoc can)) hanh vi ((su triet) OR (su viet)).
• Adding a wildcard symbol may retrieve word variants: te sac ky nang mai khoi. hieu va cac ((duc van) or (luoc can)) hanh vi ((su triet) or (su viet))*.