Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ty nang » ty xang, ty hang, ly nang
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
xa nhan » va nhan, xa phan, xuan nhan
loai ca » loai cay, loai cua, loai va
ca tren » cau tren, cu tren, la tren
ve cam » ve cham, ve cac, va cam

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