Perhaps you should try some spelling variations:
khanh thi » khanh thu, nhanh thai, phan thi
nhanh thi » nhanh thai, nhanh thuc, nhan tai
va triet » va trien, ve triet, cua triet
hieu ve » hieu va, hieu van
cam loc » cam lo
va hanh » van hanh, va thanh, va danh
va hoi » xa hoi, va hoc, va hoa
ve cam » ve cham, ve cac, va cam
loc va » hoc va, luc va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu ((khanh thi) OR (nhanh thi)) hang va hoi. hieu ve cam loc va hanh vi ((va triet) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu ((khanh thi) OR (nhanh thi)) hang va hoi. hieu ve cam loc va hanh vi ((va triet) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu ((khanh thi) OR (nhanh thi)) hang va hoi. hieu ve cam loc va hanh vi ((va triet) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: vu ((khanh thi) OR (nhanh thi)) hang va hoi. hieu ve cam loc va hanh vi ((va triet) or (va thiet))*.