Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
sach truc » sach tren, sach thu, sach thue
van hanh » van thanh, ban hanh, van anh
tham xuc » tham nuoc, tham thuc, pham duc
qua tham » qua cham, qua than, qua thanh
hanh ki » hanh vi, hanh ky, hanh kien
xuc van » duc van, luc van, vuc van
su viet » so viet
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) OR (cach thuc)) nang ((ma hoi) or (ma hoa)). hieu qua tham xuc van hanh ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach truc) OR (cach thuc)) nang ((ma hoi) OR (ma hoa)). hieu qua tham xuc van hanh ki su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach truc) OR (cach thuc)) nang ((ma hoi) or (ma hoa)). hieu qua tham xuc van hanh ki su viet*".