Perhaps you should try some spelling variations:
hanh kien » danh kien, anh kien, thanh vien
van hanh » van thanh, ban hanh, van anh
tham xuc » tham nuoc, tham thuc, pham duc
qua tham » qua cham, qua than, qua thanh
kien su » nien su, tien su, vien sau
xuc van » duc van, luc van, vuc van
tang ma » mang may, tang van
sach tu » sach thu, cach tu, sach uu
nang ma » sang ma, nang cao, mang may
sach ty » sach y, sach thu, xach tay
su viet » so viet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach tu) OR (sach ty)) ((nang ma) or (tang ma)) hoi. hieu qua tham xuc van hanh kien su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (sach ty)) ((nang ma) OR (tang ma)) hoi. hieu qua tham xuc van hanh kien su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tu) OR (sach ty)) ((nang ma) or (tang ma)) hoi. hieu qua tham xuc van hanh kien su viet".
• Adding a wildcard symbol may retrieve word variants: te ((sach tu) OR (sach ty)) ((nang ma) or (tang ma)) hoi. hieu qua tham xuc van hanh kien su viet*.