Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thi hang » thi hanh, thi nang, thi hong
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
sach thi » sach thu, sach tai, sach thieu
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
hang xa » hoang xa, hang va, hang ca
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai

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 thi hang xa hoi. hieu ((ve cam) OR (va cam)) xuc ((ban hanh) or (van hanh)) vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi hang xa hoi. hieu ((ve cam) OR (va cam)) xuc ((ban hanh) OR (van hanh)) vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi hang xa hoi. hieu ((ve cam) OR (va cam)) xuc ((ban hanh) or (van hanh)) vai cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sach thi hang xa hoi. hieu ((ve cam) OR (va cam)) xuc ((ban hanh) or (van hanh)) vai cua viet*.