Perhaps you should try some spelling variations:
hang dai » hoang dai, hang tai, hang dau
tu cach » tu cac
dua ban » cua ban, qua ban, mua ban
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (te sach)) ky nang ma hoi. hieu ve cam ((dua ban) OR (dia ban)) hang dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (te sach)) ky nang ma hoi. hieu ve cam ((dua ban) OR (dia ban)) hang dai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (te sach)) ky nang ma hoi. hieu ve cam ((dua ban) OR (dia ban)) hang dai cua tre*".