Perhaps you should try some spelling variations:
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
thu sai » thu hai, thu tai, thu san
nang ma » tang ma, sang ma, nang cao
hieu va » hieu qua
cac luu » cac luat, sach luu
sai ky » sac ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sai ky nang ma hoi. ((hieu va) or (lieu va)) cac luu ((van hanh) OR (ban hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sai ky nang ma hoi. ((hieu va) OR (lieu va)) cac luu ((van hanh) OR (ban hanh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sai ky nang ma hoi. ((hieu va) or (lieu va)) cac luu ((van hanh) OR (ban hanh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: thu sai ky nang ma hoi. ((hieu va) or (lieu va)) cac luu ((van hanh) OR (ban hanh)) vi cua te*.