Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
van hanh » van thanh, ban hanh, van anh
thu sach » thuat sach, thuoc sach, thu hoach
vuc nang » cuc nang, vu nang, chuc nang
tu sach » su sach, te sach, tu cach
xuc van » duc van, luc van, vuc van
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
vi su » va su, ve su, oi su
ki su » ky su

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