Perhaps you should try some spelling variations:
chuan thiet » chua thiet, luan thiet, chuan viet
truc ban » thuc ban, truc dan, truc van
thanh va » thanh van, hanh va, thanh ha
va chuan » va chan, va chua, va huan
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
tuc ban » thuc ban, tu ban, tuc dan
y nang » ly nang, v nang, may nang
ve cam » ve cham, ve cac, va cam

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 ((y nang) or (ky nang)) xa hoi. hieu ve cam ((tuc ban) OR (truc ban)) thanh va chuan thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((y nang) OR (ky nang)) xa hoi. hieu ve cam ((tuc ban) OR (truc ban)) thanh va chuan thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y nang) or (ky nang)) xa hoi. hieu ve cam ((tuc ban) OR (truc ban)) thanh va chuan thiet".
• Adding a wildcard symbol may retrieve word variants: su sach ((y nang) or (ky nang)) xa hoi. hieu ve cam ((tuc ban) OR (truc ban)) thanh va chuan thiet*.