Perhaps you should try some spelling variations:
chet duoc » che duoc, cho duoc, che quoc
cua viet » ca viet, hoa viet, cua vat
van tuan » van quan, van ban, anh tuan
van hanh » van thanh, ban hanh, van anh
lai cua » dai cua, hai cua, lai chau
tu sach » thu sach, te sach, tu cach
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
ve chet » ve chat, ve che, se chet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ty nang x hoi. hieu ve chet duoc ((van hanh) or (van tuan)) lai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang x hoi. hieu ve chet duoc ((van hanh) OR (van tuan)) lai cua viet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ty nang x hoi. hieu ve chet duoc ((van hanh) or (van tuan)) lai cua viet*.