Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
thu sac » thu sach, thu san, thu xac
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
sac ky » cac ky, sai 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 sac ky nang ma hoi. ((hieu van) or (hieu va)) cau truc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ma hoi. ((hieu van) OR (hieu va)) cau truc van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ma hoi. ((hieu van) or (hieu va)) cau truc van hanh vi cua te*.