Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
cuu tre » cua tre, cau tren, cau treo
cau luc » cau truc, cau phuc
cuc tre » duc tre, cua tre, cuc thue
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
hieu va » lieu va, hieu qua
luc van » luoc van, luu van, duc van
te bai » te bao, te ban, te lai
ha hoi » hoa hoi, ha noi, xa hoi
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te bai) or (te tai)) ky lang ha hoi. hieu va cau luc van hanh tai ((cuc tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te bai) OR (te tai)) ky lang ha hoi. hieu va cau luc van hanh tai ((cuc tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te bai) or (te tai)) ky lang ha hoi. hieu va cau luc van hanh tai ((cuc tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((te bai) or (te tai)) ky lang ha hoi. hieu va cau luc van hanh tai ((cuc tre) OR (cuu tre))*.