Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua viet » ca viet, hoa viet, cua vat
van hanh » ban hanh, van anh, van ban
hoc sac » hoc sach, hoc cac, hoc mac
ve cham » va cham, ve chat, vu cham
nang ma » tang ma, sang ma, nang cao
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
di cua » dai cua, doi cua, de cua
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sac ky nang ma hoi. hieu ((ve cham) or (ve cac)) xuc ((van hanh) OR (van thanh)) di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang ma hoi. hieu ((ve cham) OR (ve cac)) xuc ((van hanh) OR (van thanh)) di cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sac ky nang ma hoi. hieu ((ve cham) or (ve cac)) xuc ((van hanh) OR (van thanh)) di cua viet".
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang ma hoi. hieu ((ve cham) or (ve cac)) xuc ((van hanh) OR (van thanh)) di cua viet*.