Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
nang xa » lang xa, nang ma, mang xa
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
hanh va » hang va, hanh vi
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
chua » cua, chu

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 (nang x)) hoi. hieu van cam duc va ((hanh va) or (hanh tai)) sua chua~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang x)) hoi. hieu van cam duc va ((hanh va) OR (hanh tai)) sua chua.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) OR (nang x)) hoi. hieu van cam duc va ((hanh va) or (hanh tai)) sua chua".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) OR (nang x)) hoi. hieu van cam duc va ((hanh va) or (hanh tai)) sua chua*.