Perhaps you should try some spelling variations:
loai tren » la tren, thai tren
cham xuc » cam xuc, chat xuc, cham soc
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
kinh xa » binh xa, dinh xa, kinh va
hieu vu » hieu ve, hieu su, dieu vu
hieu va » lieu va, hieu qua
xuc van » duc van, luc van, vuc van
y kinh » ly kinh, ky kinh, o kinh

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y kinh xa hoi. ((hieu vu) OR (hieu va)) cham xuc van hanh vi ((cau tren) OR (loai tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y kinh xa hoi. ((hieu vu) OR (hieu va)) cham xuc van hanh vi ((cau tren) or (loai tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y kinh xa hoi. ((hieu vu) OR (hieu va)) cham xuc van hanh vi ((cau tren) or (loai tren))*.