Perhaps you should try some spelling variations:
thu sac » thu sach, thu san, thu xac
nang xa » nang x, nang ma, mang xa
hanh di » hanh vi, hanh de, hang di
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
ve bao » te bao, va bao
di cua » dai cua, doi cua, de cua
ve cao » va cao, ve cac, ve co
sac ky » cac ky, sai ky
cua tu » cua tuc, cua su, cua cu

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