Perhaps you should try some spelling variations:
vu cham » va cham, vu kham, tu cham
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
hieu vu » hieu va, hieu ve, hieu su
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang
voi tu » loi tu, hoi tu, moi tu
vi tu » vi tut, va tu, vu tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ma hoi. hieu vu cham ((duc va) or (thuc va)) dau ((vi tu) OR (voi tu)) tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ma hoi. hieu vu cham ((duc va) OR (thuc va)) dau ((vi tu) OR (voi tu)) tieng.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ma hoi. hieu vu cham ((duc va) or (thuc va)) dau ((vi tu) OR (voi tu)) tieng".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ma hoi. hieu vu cham ((duc va) or (thuc va)) dau ((vi tu) OR (voi tu)) tieng*.