Perhaps you should try some spelling variations:
xanh hanh » danh thanh, ban hanh, van hanh
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
hanh tai » thanh tai, hang tai, han tai
suc xanh » suc manh, suc canh, tuoc xanh
dao suc » dao duc, dao tuc, cao suc
lang ky » tang ky, bang ky, lang ke
nang ma » tang ma, sang ma, nang cao
dang ky » dang y, dan ky, dong 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 ((lang ky) or (dang ky)) nang ma hoi. hieu van dao suc xanh hanh tai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((lang ky) OR (dang ky)) nang ma hoi. hieu van dao suc xanh hanh tai ((dua tren) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu ((lang ky) or (dang ky)) nang ma hoi. hieu van dao suc xanh hanh tai ((dua tren) or (cua te))*.