Perhaps you should try some spelling variations:
thanh gian » thanh giang, thach giang, thanh san
hanh gian » thanh giang, manh giang, dan gian
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ban bo » can bo, ban do, ban co
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ky nang ma hoi. hieu va ((ban bo) or (bac bo)) va ((hanh gian) OR (thanh gian)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky nang ma hoi. hieu va ((ban bo) OR (bac bo)) va ((hanh gian) OR (thanh gian)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ky nang ma hoi. hieu va ((ban bo) or (bac bo)) va ((hanh gian) OR (thanh gian)) cua tre".
• Adding a wildcard symbol may retrieve word variants: so sanh ky nang ma hoi. hieu va ((ban bo) or (bac bo)) va ((hanh gian) OR (thanh gian)) cua tre*.