Perhaps you should try some spelling variations:
truc nang » truc nano, truc trang, truoc bang
van hanh » van thanh, ban hanh, van anh
tru nang » tra nang, tri nang, truc nano
tham xuc » tham nuoc, tham thuc, pham duc
tu sach » thu sach, su sach, te sach
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
va tham » van tham, va cham, va thanh
su viet » so viet
hieu va » lieu va, hieu qua
ma hoi » mai hoi, xa hoi, me hoi
ki su » ky su

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 ((truc nang) OR (tru nang)) ((ma hoi) or (ma hoa)). hieu va tham xuc van hanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((truc nang) OR (tru nang)) ((ma hoi) OR (ma hoa)). hieu va tham xuc van hanh ki su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((truc nang) OR (tru nang)) ((ma hoi) or (ma hoa)). hieu va tham xuc van hanh ki su viet*".