Perhaps you should try some spelling variations:
trinh vat » trinh van, trinh luat, sinh vat
thu nang » thi nang, thu bang, tho nang
thu hang » thi hang, thuc hanh, thu huong
tu sach » thu sach, su sach, te sach
tinh va » tich va, trinh van, tinh gia
hieu ve » hieu va, hieu van
xuc va » duc va, tuc va, luc va
ve cam » ve cham, ve cac, va cam
va hoi » xa hoi, va hoc, va hoa

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