Perhaps you should try some spelling variations:
tu ngang » tu ngan, hu angang, vu ngan
ngang co » ngang cho, nang co, nganh co
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach tu » sach thu, cach tu, sach ty
hieu va » lieu va, hieu qua
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
cua cau » cua cac, cua can, cua cu
cua cay » cua cac
cua chu » sua chua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu ngang co hoc. hieu va cac vuc van hanh vi ((((cua cau) OR (cua cay))) OR (cua chu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu ngang co hoc. hieu va cac vuc van hanh vi ((((cua cau) OR (cua cay))) or (cua chu))~".
• Adding a wildcard symbol may retrieve word variants: te sach tu ngang co hoc. hieu va cac vuc van hanh vi ((((cua cau) OR (cua cay))) or (cua chu))*.