Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
nang mai » nang ma, nang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
luoc can » luc canh, luoc dai, duoc cac
hoc can » hoc dan, hoc cao, hoc cac
hieu ve » hieu va, hieu van
hanh ki » hanh vi, hanh ky, hanh kien
duc van » duc va, duc tan, duc manh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ve cac » va cac, vien cac
ki su » ky su

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 ve cac ((duc van) or (((luoc can) or (hoc can)))) hanh ki su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang mai khoi. hieu ve cac ((duc van) OR (((luoc can) OR (hoc can)))) hanh ki su triet.
• Adding a wildcard symbol may retrieve word variants: te sac ky nang mai khoi. hieu ve cac ((duc van) or (((luoc can) or (hoc can)))) hanh ki su triet*.