Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cau theo » cau thi, cau tao
thu hang » thi hang, thuc hanh, thu huong
hanh vai » hanh vi, hanh va, hanh tai
sach thu » sach thue, sach thieu, sach tham
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
hang o » hang do, hang o2, hoang o
xuc va » tuc va, luc va, xac va
o hoi » co hoi, o hoc, o hai

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 thu hang o hoi. hieu ve cam ((xuc va) or (duc va)) ((hanh vai) or (thanh tai)) cau theo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu hang o hoi. hieu ve cam ((xuc va) OR (duc va)) ((hanh vai) OR (thanh tai)) cau theo.
• Adding a wildcard symbol may retrieve word variants: tu sach thu hang o hoi. hieu ve cam ((xuc va) or (duc va)) ((hanh vai) or (thanh tai)) cau theo*.