Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cua xuc » cua tuc, cua cuc, cua nuoc
cua duc » cua tuc, cua nuoc, cua quoc
va hanh » van hanh, va thanh, va danh
tu ang » tu lang, tu anc, tu quang
tu anh » tu hanh, tu manh, thu anh
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tu ang) or (tu anh)) xa hoi. hieu va ((cua xuc) OR (cua duc)) va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tu ang) OR (tu anh)) xa hoi. hieu va ((cua xuc) OR (cua duc)) va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tu ang) or (tu anh)) xa hoi. hieu va ((cua xuc) OR (cua duc)) va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tu ang) or (tu anh)) xa hoi. hieu va ((cua xuc) OR (cua duc)) va hanh vi cua te*.