Perhaps you should try some spelling variations:
thu sac » thu sach, thu xac, thu dac
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
thu san » thuy san, thu ban, phu san
nang xa » nang x, lang xa, nang ma
ve cac » va cac, vien cac
lo van » le van, vo van, so van
va cua » va chua, via cua, ca cua
lo va » lao va, ly va, le va

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

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