Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
nam qua » nam quan, nam cua, nam mua
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
lang ha » long ha
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) or (lang ha)) hoi. hieu van nam qua ((van hanh) or (ban hanh)) doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (lang ha)) hoi. hieu van nam qua ((van hanh) OR (ban hanh)) doi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) or (lang ha)) hoi. hieu van nam qua ((van hanh) or (ban hanh)) doi cua tre*.