Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
ban hanh » ban hang
cham duc » pham duc, cham soc, pham duy
ve cham » va cham, ve chat, vu cham
hanh ca » hanh cac, hanh cat, hanh cua
tu sach » thu sach, su sach, te sach
ky lang » ky nang, ky dang, ky tang
duc ban » duc tan, duc van, dua ban
hieu ve » hieu va, hieu van
tu sac » tu cac, tu san, tu bac
ha hoi » hoa hoi, ha noi, va hoi
ca su » cua su, cao su, ca sau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu sach)) ky lang ((ha hoi) OR (xa hoi)). hieu ve cham duc ban hanh ca su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ky lang ((ha hoi) OR (xa hoi)). hieu ve cham duc ban hanh ca su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu sach)) ky lang ((ha hoi) OR (xa hoi)). hieu ve cham duc ban hanh ca su triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu sach)) ky lang ((ha hoi) OR (xa hoi)). hieu ve cham duc ban hanh ca su triet*.