Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh vai » hanh vi, hanh tai, hanh van
sach ty » sach y, sach tu, sach thu
hanh va » hang va, hanh vi
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
va cham » va chat, va tham
ve cam » ve cham, ve cac, va cam
x hoi » xa hoi, o hoi, x ho

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 ty nang x hoi. hieu ((ve cam) or (va cham)) tuc xa ((hanh vai) OR (hanh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang x hoi. hieu ((ve cam) OR (va cham)) tuc xa ((hanh vai) OR (hanh va)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang x hoi. hieu ((ve cam) or (va cham)) tuc xa ((hanh vai) OR (hanh va)) cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang x hoi. hieu ((ve cam) or (va cham)) tuc xa ((hanh vai) OR (hanh va)) cau tren*.