Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
hanh va » hanh vi
cu tren » tu tren, dua tren
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa

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 ((ky lang) or (ky nang)) xa hoi. hieu va cam tuc va ((hanh va) or (hang va)) cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu va cam tuc va ((hanh va) OR (hang va)) cu tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. hieu va cam tuc va ((hanh va) or (hang va)) cu tren*.