Perhaps you should try some spelling variations:
canh hanh » xanh hanh, canh tranh, danh thanh
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
suc canh » luc canh, suc manh, luoc canh
hanh tai » thanh tai, hang tai, han tai
van cao » van dao, van bao, van hao
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
cao suc » cao su, cao duc
tu sac » tu sach, tu cac, tu san
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 sac ((ky lang) OR (ky tang)) xa hoi. hieu van cao suc canh hanh tai ((dua tren) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ((ky lang) OR (ky tang)) xa hoi. hieu van cao suc canh hanh tai ((dua tren) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ((ky lang) OR (ky tang)) xa hoi. hieu van cao suc canh hanh tai ((dua tren) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sac ((ky lang) OR (ky tang)) xa hoi. hieu van cao suc canh hanh tai ((dua tren) or (cua te))*.