Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
soc van » hoc van, oc van, sac van
vi cau » va cau, ve cau, viet cau
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuat sach)) ty nang xa hoi. hieu va cham soc van hanh ((vi cau) OR (di cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuat sach)) ty nang xa hoi. hieu va cham soc van hanh ((vi cau) OR (di cau)) tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu hoach) or (thuat sach)) ty nang xa hoi. hieu va cham soc van hanh ((vi cau) OR (di cau)) tren".
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuat sach)) ty nang xa hoi. hieu va cham soc van hanh ((vi cau) OR (di cau)) tren*.