Perhaps you should try some spelling variations:
dan khanh » dang khanh, van khanh, dat khanh
chat cua » nhat cua, chat va, chat huu
van chat » cao chat
dan hanh » dang hanh, dan thanh, ban hanh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
sai ky » sac ky
di cua » dai cua, doi cua, de cua
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky ((nang xa) or (lang xa)) hoi. hieu van chat cua ((dan hanh) OR (dan khanh)) di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky ((nang xa) OR (lang xa)) hoi. hieu van chat cua ((dan hanh) OR (dan khanh)) di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky ((nang xa) or (lang xa)) hoi. hieu van chat cua ((dan hanh) OR (dan khanh)) di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sai ky ((nang xa) or (lang xa)) hoi. hieu van chat cua ((dan hanh) OR (dan khanh)) di cua tre*.