Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
vu khach » vu khanh, vu khac, vay khach
hanh vai » hanh vi, hanh tai, hanh van
trang xa » trang va, trang ha, trong xa
hanh va » hang va, hanh vi
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
y trang » _ trang, y trong, y trung
cac tuc » cac toc, cac tu, cac tac
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (vu khach)) y trang xa hoi. hieu ve cac tuc va ((hanh vai) OR (hanh va)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) y trang xa hoi. hieu ve cac tuc va ((hanh vai) OR (hanh va)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu khach)) y trang xa hoi. hieu ve cac tuc va ((hanh vai) OR (hanh va)) cua viet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu khach)) y trang xa hoi. hieu ve cac tuc va ((hanh vai) OR (hanh va)) cua viet*.