Perhaps you should try some spelling variations:
thi hang » thi hanh, thi nang, thi hong
va cham » va chat, va tham
hanh va » hang va, hanh vi
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
va cua » va chua, via cua, ca cua
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: su sach ((thi hang) or (ty xang)) xa hoi. hieu va cham ((xac va) or (tuc va)) hanh va cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((thi hang) OR (ty xang)) xa hoi. hieu va cham ((xac va) OR (tuc va)) hanh va cua tu.
• Adding a wildcard symbol may retrieve word variants: su sach ((thi hang) or (ty xang)) xa hoi. hieu va cham ((xac va) or (tuc va)) hanh va cua tu*.