Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
vu sach » vu bach, su sach
thuc va » thuc dan, thuc day
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ve nam » he nam, va nam, le nam
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: ((vu sach) OR (vu khach)) ky nang ma hoi. hieu ve nam ((thuc va) or (thuc vat)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ky nang ma hoi. hieu ve nam ((thuc va) OR (thuc vat)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) ky nang ma hoi. hieu ve nam ((thuc va) or (thuc vat)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) ky nang ma hoi. hieu ve nam ((thuc va) or (thuc vat)) hanh vi cua te*.