Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
van chat » cao chat
chat xuc » chat huu, cam xuc, chao xu
sach ty » sach y, sach tu, sach thu
xuc van » duc van, luc van, vuc van
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, te sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang cao) or (nang x)) hoi. hieu van chat xuc van hanh tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang cao) OR (nang x)) hoi. hieu van chat xuc van hanh tai ((cuu tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang cao) or (nang x)) hoi. hieu van chat xuc van hanh tai ((cuu tre) or (cau tren))*.