Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
nang mai » nang ma, nang tai, lang mai
hanh tai » hang tai, han tai, hinh tai
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
thu va » thuc va, thue va, tu va
va nam » van nam, ha nam, va nay

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

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