Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, dang hanh
van hanh » van thanh, ban hanh, van anh
dua tren » dung tren
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cac suc » cao suc, cac nuoc, cac cuoc
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
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: tu san ky nang ma hoi. hieu va cac suc ((xanh hanh) or (van hanh)) tai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ma hoi. hieu va cac suc ((xanh hanh) OR (van hanh)) tai ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ma hoi. hieu va cac suc ((xanh hanh) or (van hanh)) tai ((dua tren) or (cua te))*.