Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
luoc can » luc canh, hoc can, luoc dai
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san
vi su » va su, ki su, oi su
ve su » va 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 hoi. hieu ve cac ((duc van) or (luoc can)) hanh ((vi su) OR (ve su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang mai hoi. hieu ve cac ((duc van) OR (luoc can)) hanh ((vi su) OR (ve su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang mai hoi. hieu ve cac ((duc van) or (luoc can)) hanh ((vi su) OR (ve su)) triet".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang mai hoi. hieu ve cac ((duc van) or (luoc can)) hanh ((vi su) OR (ve su)) triet*.